cef/libcef/browser/browser_host_base.cc

// Copyright 2020 The Chromium Embedded Framework Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "libcef/browser/browser_host_base.h"

#include <tuple>

#include "libcef/browser/browser_info_manager.h"
#include "libcef/browser/browser_platform_delegate.h"
#include "libcef/browser/context.h"
#include "libcef/browser/image_impl.h"
#include "libcef/browser/navigation_entry_impl.h"
#include "libcef/browser/thread_util.h"
#include "libcef/common/frame_util.h"
#include "libcef/common/net/url_util.h"

#include "base/logging.h"
#include "chrome/browser/spellchecker/spellcheck_factory.h"
#include "chrome/browser/spellchecker/spellcheck_service.h"
#include "components/favicon/core/favicon_url.h"
#include "components/spellcheck/common/spellcheck_features.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/download_manager.h"
#include "content/public/browser/download_request_utils.h"
#include "content/public/browser/navigation_entry.h"
#include "ui/gfx/image/image_skia.h"

#if BUILDFLAG(IS_MAC)
#include "components/spellcheck/browser/spellcheck_platform.h"
#endif

namespace {

// Associates a CefBrowserHostBase instance with a WebContents. This object will
// be deleted automatically when the WebContents is destroyed.
class WebContentsUserDataAdapter : public base::SupportsUserData::Data {
 public:
  static void Register(CefRefPtr<CefBrowserHostBase> browser) {
    new WebContentsUserDataAdapter(browser);
  }

  static CefRefPtr<CefBrowserHostBase> Get(
      const content::WebContents* web_contents) {
    WebContentsUserDataAdapter* adapter =
        static_cast<WebContentsUserDataAdapter*>(
            web_contents->GetUserData(UserDataKey()));
    if (adapter)
      return adapter->browser_;
    return nullptr;
  }

 private:
  WebContentsUserDataAdapter(CefRefPtr<CefBrowserHostBase> browser)
      : browser_(browser) {
    auto web_contents = browser->GetWebContents();
    DCHECK(web_contents);
    web_contents->SetUserData(UserDataKey(), base::WrapUnique(this));
  }

  static void* UserDataKey() {
    // We just need a unique constant. Use the address of a static that
    // COMDAT folding won't touch in an optimizing linker.
    static int data_key = 0;
    return reinterpret_cast<void*>(&data_key);
  }

  CefRefPtr<CefBrowserHostBase> browser_;
};

}  // namespace

// static
CefRefPtr<CefBrowserHostBase> CefBrowserHostBase::GetBrowserForHost(
    const content::RenderViewHost* host) {
  DCHECK(host);
  CEF_REQUIRE_UIT();
  content::WebContents* web_contents = content::WebContents::FromRenderViewHost(
      const_cast<content::RenderViewHost*>(host));
  if (web_contents)
    return GetBrowserForContents(web_contents);
  return nullptr;
}

// static
CefRefPtr<CefBrowserHostBase> CefBrowserHostBase::GetBrowserForHost(
    const content::RenderFrameHost* host) {
  DCHECK(host);
  CEF_REQUIRE_UIT();
  content::WebContents* web_contents =
      content::WebContents::FromRenderFrameHost(
          const_cast<content::RenderFrameHost*>(host));
  if (web_contents)
    return GetBrowserForContents(web_contents);
  return nullptr;
}

// static
CefRefPtr<CefBrowserHostBase> CefBrowserHostBase::GetBrowserForContents(
    const content::WebContents* contents) {
  DCHECK(contents);
  CEF_REQUIRE_UIT();
  return WebContentsUserDataAdapter::Get(contents);
}

// static
CefRefPtr<CefBrowserHostBase> CefBrowserHostBase::GetBrowserForGlobalId(
    const content::GlobalRenderFrameHostId& global_id) {
  if (!frame_util::IsValidGlobalId(global_id)) {
    return nullptr;
  }

  if (CEF_CURRENTLY_ON_UIT()) {
    // Use the non-thread-safe but potentially faster approach.
    content::RenderFrameHost* render_frame_host =
        content::RenderFrameHost::FromID(global_id);
    if (!render_frame_host)
      return nullptr;
    return GetBrowserForHost(render_frame_host);
  } else {
    // Use the thread-safe approach.
    bool is_guest_view = false;
    auto info = CefBrowserInfoManager::GetInstance()->GetBrowserInfo(
        global_id, &is_guest_view);
    if (info && !is_guest_view) {
      auto browser = info->browser();
      if (!browser) {
        LOG(WARNING) << "Found browser id " << info->browser_id()
                     << " but no browser object matching frame "
                     << frame_util::GetFrameDebugString(global_id);
      }
      return browser;
    }
    return nullptr;
  }
}

CefBrowserHostBase::CefBrowserHostBase(
    const CefBrowserSettings& settings,
    CefRefPtr<CefClient> client,
    std::unique_ptr<CefBrowserPlatformDelegate> platform_delegate,
    scoped_refptr<CefBrowserInfo> browser_info,
    CefRefPtr<CefRequestContextImpl> request_context)
    : settings_(settings),
      client_(client),
      platform_delegate_(std::move(platform_delegate)),
      browser_info_(browser_info),
      request_context_(request_context),
      is_views_hosted_(platform_delegate_->IsViewsHosted()) {
  CEF_REQUIRE_UIT();
  DCHECK(!browser_info_->browser().get());
  browser_info_->SetBrowser(this);

  contents_delegate_ =
      std::make_unique<CefBrowserContentsDelegate>(browser_info_);
  contents_delegate_->AddObserver(this);
}

void CefBrowserHostBase::InitializeBrowser() {
  CEF_REQUIRE_UIT();

  // Associate the WebContents with this browser object.
  DCHECK(GetWebContents());
  WebContentsUserDataAdapter::Register(this);
}

void CefBrowserHostBase::DestroyBrowser() {
  CEF_REQUIRE_UIT();

  devtools_manager_.reset(nullptr);

  platform_delegate_.reset(nullptr);

  contents_delegate_->RemoveObserver(this);
  contents_delegate_->ObserveWebContents(nullptr);

  CefBrowserInfoManager::GetInstance()->RemoveBrowserInfo(browser_info_);
  browser_info_->SetBrowser(nullptr);
}

CefRefPtr<CefBrowser> CefBrowserHostBase::GetBrowser() {
  return this;
}

CefRefPtr<CefClient> CefBrowserHostBase::GetClient() {
  return client_;
}

CefRefPtr<CefRequestContext> CefBrowserHostBase::GetRequestContext() {
  return request_context_;
}

bool CefBrowserHostBase::HasView() {
  return is_views_hosted_;
}

void CefBrowserHostBase::SetFocus(bool focus) {
  // Always execute asynchronously to work around issue #3040.
  CEF_POST_TASK(CEF_UIT, base::BindOnce(&CefBrowserHostBase::SetFocusInternal,
                                        this, focus));
}

void CefBrowserHostBase::SetFocusInternal(bool focus) {
  CEF_REQUIRE_UIT();
  if (focus)
    OnSetFocus(FOCUS_SOURCE_SYSTEM);
  else if (platform_delegate_)
    platform_delegate_->SetFocus(false);
}

void CefBrowserHostBase::StartDownload(const CefString& url) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(
        CEF_UIT, base::BindOnce(&CefBrowserHostBase::StartDownload, this, url));
    return;
  }

  GURL gurl = GURL(url.ToString());
  if (gurl.is_empty() || !gurl.is_valid())
    return;

  auto web_contents = GetWebContents();
  if (!web_contents)
    return;

  auto browser_context = web_contents->GetBrowserContext();
  if (!browser_context)
    return;

  content::DownloadManager* manager = browser_context->GetDownloadManager();
  if (!manager)
    return;

  std::unique_ptr<download::DownloadUrlParameters> params(
      content::DownloadRequestUtils::CreateDownloadForWebContentsMainFrame(
          web_contents, gurl, MISSING_TRAFFIC_ANNOTATION));
  manager->DownloadUrl(std::move(params));
}

void CefBrowserHostBase::DownloadImage(
    const CefString& image_url,
    bool is_favicon,
    uint32 max_image_size,
    bool bypass_cache,
    CefRefPtr<CefDownloadImageCallback> callback) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(
        CEF_UIT,
        base::BindOnce(&CefBrowserHostBase::DownloadImage, this, image_url,
                       is_favicon, max_image_size, bypass_cache, callback));
    return;
  }

  if (!callback)
    return;

  GURL gurl = GURL(image_url.ToString());
  if (gurl.is_empty() || !gurl.is_valid())
    return;

  auto web_contents = GetWebContents();
  if (!web_contents)
    return;

  web_contents->DownloadImage(
      gurl, is_favicon, gfx::Size(max_image_size, max_image_size),
      max_image_size * gfx::ImageSkia::GetMaxSupportedScale(), bypass_cache,
      base::BindOnce(
          [](uint32 max_image_size,
             CefRefPtr<CefDownloadImageCallback> callback, int id,
             int http_status_code, const GURL& image_url,
             const std::vector<SkBitmap>& bitmaps,
             const std::vector<gfx::Size>& sizes) {
            CEF_REQUIRE_UIT();

            CefRefPtr<CefImageImpl> image_impl;

            if (!bitmaps.empty()) {
              image_impl = new CefImageImpl();
              image_impl->AddBitmaps(max_image_size, bitmaps);
            }

            callback->OnDownloadImageFinished(
                image_url.spec(), http_status_code, image_impl.get());
          },
          max_image_size, callback));
}

bool CefBrowserHostBase::SendDevToolsMessage(const void* message,
                                             size_t message_size) {
  if (!message || message_size == 0)
    return false;

  if (!CEF_CURRENTLY_ON_UIT()) {
    std::string message_str(static_cast<const char*>(message), message_size);
    CEF_POST_TASK(
        CEF_UIT,
        base::BindOnce(
            [](CefRefPtr<CefBrowserHostBase> self, std::string message_str) {
              self->SendDevToolsMessage(message_str.data(), message_str.size());
            },
            CefRefPtr<CefBrowserHostBase>(this), std::move(message_str)));
    return false;
  }

  if (!EnsureDevToolsManager())
    return false;
  return devtools_manager_->SendDevToolsMessage(message, message_size);
}

int CefBrowserHostBase::ExecuteDevToolsMethod(
    int message_id,
    const CefString& method,
    CefRefPtr<CefDictionaryValue> params) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(
        CEF_UIT, base::BindOnce(base::IgnoreResult(
                                    &CefBrowserHostBase::ExecuteDevToolsMethod),
                                this, message_id, method, params));
    return 0;
  }

  if (!EnsureDevToolsManager())
    return 0;
  return devtools_manager_->ExecuteDevToolsMethod(message_id, method, params);
}

CefRefPtr<CefRegistration> CefBrowserHostBase::AddDevToolsMessageObserver(
    CefRefPtr<CefDevToolsMessageObserver> observer) {
  if (!observer)
    return nullptr;
  auto registration = CefDevToolsManager::CreateRegistration(observer);
  InitializeDevToolsRegistrationOnUIThread(registration);
  return registration.get();
}

void CefBrowserHostBase::GetNavigationEntries(
    CefRefPtr<CefNavigationEntryVisitor> visitor,
    bool current_only) {
  DCHECK(visitor.get());
  if (!visitor.get())
    return;

  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(
        CEF_UIT, base::BindOnce(&CefBrowserHostBase::GetNavigationEntries, this,
                                visitor, current_only));
    return;
  }

  auto web_contents = GetWebContents();
  if (!web_contents)
    return;

  content::NavigationController& controller = web_contents->GetController();
  const int total = controller.GetEntryCount();
  const int current = controller.GetCurrentEntryIndex();

  if (current_only) {
    // Visit only the current entry.
    CefRefPtr<CefNavigationEntryImpl> entry =
        new CefNavigationEntryImpl(controller.GetEntryAtIndex(current));
    visitor->Visit(entry.get(), true, current, total);
    std::ignore = entry->Detach(nullptr);
  } else {
    // Visit all entries.
    bool cont = true;
    for (int i = 0; i < total && cont; ++i) {
      CefRefPtr<CefNavigationEntryImpl> entry =
          new CefNavigationEntryImpl(controller.GetEntryAtIndex(i));
      cont = visitor->Visit(entry.get(), (i == current), i, total);
      std::ignore = entry->Detach(nullptr);
    }
  }
}

CefRefPtr<CefNavigationEntry> CefBrowserHostBase::GetVisibleNavigationEntry() {
  if (!CEF_CURRENTLY_ON_UIT()) {
    NOTREACHED() << "called on invalid thread";
    return nullptr;
  }

  content::NavigationEntry* entry = nullptr;
  auto web_contents = GetWebContents();
  if (web_contents)
    entry = web_contents->GetController().GetVisibleEntry();

  if (!entry)
    return nullptr;

  return new CefNavigationEntryImpl(entry);
}

void CefBrowserHostBase::NotifyMoveOrResizeStarted() {
#if BUILDFLAG(IS_WIN) || (BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_MAC))
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(
        CEF_UIT,
        base::BindOnce(&CefBrowserHostBase::NotifyMoveOrResizeStarted, this));
    return;
  }

  if (platform_delegate_)
    platform_delegate_->NotifyMoveOrResizeStarted();
#endif
}

void CefBrowserHostBase::ReplaceMisspelling(const CefString& word) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(
        CEF_UIT,
        base::BindOnce(&CefBrowserHostBase::ReplaceMisspelling, this, word));
    return;
  }

  auto web_contents = GetWebContents();
  if (web_contents)
    web_contents->ReplaceMisspelling(word);
}

void CefBrowserHostBase::AddWordToDictionary(const CefString& word) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(
        CEF_UIT,
        base::BindOnce(&CefBrowserHostBase::AddWordToDictionary, this, word));
    return;
  }

  auto web_contents = GetWebContents();
  if (!web_contents)
    return;

  SpellcheckService* spellcheck = nullptr;
  content::BrowserContext* browser_context = web_contents->GetBrowserContext();
  if (browser_context) {
    spellcheck = SpellcheckServiceFactory::GetForContext(browser_context);
    if (spellcheck)
      spellcheck->GetCustomDictionary()->AddWord(word);
  }
#if BUILDFLAG(IS_MAC)
  if (spellcheck && spellcheck::UseBrowserSpellChecker()) {
    spellcheck_platform::AddWord(spellcheck->platform_spell_checker(), word);
  }
#endif
}

void CefBrowserHostBase::SendKeyEvent(const CefKeyEvent& event) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT, base::BindOnce(&CefBrowserHostBase::SendKeyEvent,
                                          this, event));
    return;
  }

  if (platform_delegate_)
    platform_delegate_->SendKeyEvent(event);
}

void CefBrowserHostBase::SendMouseClickEvent(const CefMouseEvent& event,
                                             MouseButtonType type,
                                             bool mouseUp,
                                             int clickCount) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT,
                  base::BindOnce(&CefBrowserHostBase::SendMouseClickEvent, this,
                                 event, type, mouseUp, clickCount));
    return;
  }

  if (platform_delegate_) {
    platform_delegate_->SendMouseClickEvent(event, type, mouseUp, clickCount);
  }
}

void CefBrowserHostBase::SendMouseMoveEvent(const CefMouseEvent& event,
                                            bool mouseLeave) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT,
                  base::BindOnce(&CefBrowserHostBase::SendMouseMoveEvent, this,
                                 event, mouseLeave));
    return;
  }

  if (platform_delegate_) {
    platform_delegate_->SendMouseMoveEvent(event, mouseLeave);
  }
}

void CefBrowserHostBase::SendMouseWheelEvent(const CefMouseEvent& event,
                                             int deltaX,
                                             int deltaY) {
  if (deltaX == 0 && deltaY == 0) {
    // Nothing to do.
    return;
  }

  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT,
                  base::BindOnce(&CefBrowserHostBase::SendMouseWheelEvent, this,
                                 event, deltaX, deltaY));
    return;
  }

  if (platform_delegate_) {
    platform_delegate_->SendMouseWheelEvent(event, deltaX, deltaY);
  }
}

bool CefBrowserHostBase::IsValid() {
  return browser_info_->browser() == this;
}

CefRefPtr<CefBrowserHost> CefBrowserHostBase::GetHost() {
  return this;
}

bool CefBrowserHostBase::CanGoBack() {
  base::AutoLock lock_scope(state_lock_);
  return can_go_back_;
}

void CefBrowserHostBase::GoBack() {
  auto callback = base::BindOnce(&CefBrowserHostBase::GoBack, this);
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT, std::move(callback));
    return;
  }

  if (browser_info_->IsNavigationLocked(std::move(callback))) {
    return;
  }

  auto wc = GetWebContents();
  if (wc && wc->GetController().CanGoBack()) {
    wc->GetController().GoBack();
  }
}

bool CefBrowserHostBase::CanGoForward() {
  base::AutoLock lock_scope(state_lock_);
  return can_go_forward_;
}

void CefBrowserHostBase::GoForward() {
  auto callback = base::BindOnce(&CefBrowserHostBase::GoForward, this);
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT, std::move(callback));
    return;
  }

  if (browser_info_->IsNavigationLocked(std::move(callback))) {
    return;
  }

  auto wc = GetWebContents();
  if (wc && wc->GetController().CanGoForward()) {
    wc->GetController().GoForward();
  }
}

bool CefBrowserHostBase::IsLoading() {
  base::AutoLock lock_scope(state_lock_);
  return is_loading_;
}

void CefBrowserHostBase::Reload() {
  auto callback = base::BindOnce(&CefBrowserHostBase::Reload, this);
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT, std::move(callback));
    return;
  }

  if (browser_info_->IsNavigationLocked(std::move(callback))) {
    return;
  }

  auto wc = GetWebContents();
  if (wc) {
    wc->GetController().Reload(content::ReloadType::NORMAL, true);
  }
}

void CefBrowserHostBase::ReloadIgnoreCache() {
  auto callback = base::BindOnce(&CefBrowserHostBase::ReloadIgnoreCache, this);
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT, std::move(callback));
    return;
  }

  if (browser_info_->IsNavigationLocked(std::move(callback))) {
    return;
  }

  auto wc = GetWebContents();
  if (wc) {
    wc->GetController().Reload(content::ReloadType::BYPASSING_CACHE, true);
  }
}

void CefBrowserHostBase::StopLoad() {
  auto callback = base::BindOnce(&CefBrowserHostBase::StopLoad, this);
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT, std::move(callback));
    return;
  }

  if (browser_info_->IsNavigationLocked(std::move(callback))) {
    return;
  }

  auto wc = GetWebContents();
  if (wc) {
    wc->Stop();
  }
}

int CefBrowserHostBase::GetIdentifier() {
  return browser_id();
}

bool CefBrowserHostBase::IsSame(CefRefPtr<CefBrowser> that) {
  auto impl = static_cast<CefBrowserHostBase*>(that.get());
  return (impl == this);
}

bool CefBrowserHostBase::HasDocument() {
  base::AutoLock lock_scope(state_lock_);
  return has_document_;
}

bool CefBrowserHostBase::IsPopup() {
  return browser_info_->is_popup();
}

CefRefPtr<CefFrame> CefBrowserHostBase::GetMainFrame() {
  return GetFrame(CefFrameHostImpl::kMainFrameId);
}

CefRefPtr<CefFrame> CefBrowserHostBase::GetFocusedFrame() {
  return GetFrame(CefFrameHostImpl::kFocusedFrameId);
}

CefRefPtr<CefFrame> CefBrowserHostBase::GetFrame(int64 identifier) {
  if (identifier == CefFrameHostImpl::kInvalidFrameId) {
    return nullptr;
  } else if (identifier == CefFrameHostImpl::kMainFrameId) {
    return browser_info_->GetMainFrame();
  } else if (identifier == CefFrameHostImpl::kFocusedFrameId) {
    base::AutoLock lock_scope(state_lock_);
    if (!focused_frame_) {
      // The main frame is focused by default.
      return browser_info_->GetMainFrame();
    }
    return focused_frame_;
  }

  return browser_info_->GetFrameForGlobalId(
      frame_util::MakeGlobalId(identifier));
}

CefRefPtr<CefFrame> CefBrowserHostBase::GetFrame(const CefString& name) {
  for (const auto& frame : browser_info_->GetAllFrames()) {
    if (frame->GetName() == name)
      return frame;
  }
  return nullptr;
}

size_t CefBrowserHostBase::GetFrameCount() {
  return browser_info_->GetAllFrames().size();
}

void CefBrowserHostBase::GetFrameIdentifiers(std::vector<int64>& identifiers) {
  if (identifiers.size() > 0)
    identifiers.clear();

  const auto frames = browser_info_->GetAllFrames();
  if (frames.empty())
    return;

  identifiers.reserve(frames.size());
  for (const auto& frame : frames) {
    identifiers.push_back(frame->GetIdentifier());
  }
}

void CefBrowserHostBase::GetFrameNames(std::vector<CefString>& names) {
  if (names.size() > 0)
    names.clear();

  const auto frames = browser_info_->GetAllFrames();
  if (frames.empty())
    return;

  names.reserve(frames.size());
  for (const auto& frame : frames) {
    names.push_back(frame->GetName());
  }
}

void CefBrowserHostBase::OnStateChanged(CefBrowserContentsState state_changed) {
  // Make sure that CefBrowser state is consistent before the associated
  // CefClient callback is executed.
  base::AutoLock lock_scope(state_lock_);
  if ((state_changed & CefBrowserContentsState::kNavigation) ==
      CefBrowserContentsState::kNavigation) {
    is_loading_ = contents_delegate_->is_loading();
    can_go_back_ = contents_delegate_->can_go_back();
    can_go_forward_ = contents_delegate_->can_go_forward();
  }
  if ((state_changed & CefBrowserContentsState::kDocument) ==
      CefBrowserContentsState::kDocument) {
    has_document_ = contents_delegate_->has_document();
  }
  if ((state_changed & CefBrowserContentsState::kFullscreen) ==
      CefBrowserContentsState::kFullscreen) {
    is_fullscreen_ = contents_delegate_->is_fullscreen();
  }
  if ((state_changed & CefBrowserContentsState::kFocusedFrame) ==
      CefBrowserContentsState::kFocusedFrame) {
    focused_frame_ = contents_delegate_->focused_frame();
  }
}

void CefBrowserHostBase::OnWebContentsDestroyed(
    content::WebContents* web_contents) {}

CefRefPtr<CefFrame> CefBrowserHostBase::GetFrameForHost(
    const content::RenderFrameHost* host) {
  CEF_REQUIRE_UIT();
  if (!host)
    return nullptr;

  return browser_info_->GetFrameForHost(host);
}

CefRefPtr<CefFrame> CefBrowserHostBase::GetFrameForGlobalId(
    const content::GlobalRenderFrameHostId& global_id) {
  return browser_info_->GetFrameForGlobalId(global_id, nullptr);
}

void CefBrowserHostBase::AddObserver(Observer* observer) {
  CEF_REQUIRE_UIT();
  observers_.AddObserver(observer);
}

void CefBrowserHostBase::RemoveObserver(Observer* observer) {
  CEF_REQUIRE_UIT();
  observers_.RemoveObserver(observer);
}

bool CefBrowserHostBase::HasObserver(Observer* observer) const {
  CEF_REQUIRE_UIT();
  return observers_.HasObserver(observer);
}

void CefBrowserHostBase::LoadMainFrameURL(
    const content::OpenURLParams& params) {
  auto callback =
      base::BindOnce(&CefBrowserHostBase::LoadMainFrameURL, this, params);
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT, std::move(callback));
    return;
  }

  if (browser_info_->IsNavigationLocked(std::move(callback))) {
    return;
  }

  if (Navigate(params)) {
    OnSetFocus(FOCUS_SOURCE_NAVIGATION);
  }
}

bool CefBrowserHostBase::Navigate(const content::OpenURLParams& params) {
  CEF_REQUIRE_UIT();
  auto web_contents = GetWebContents();
  if (web_contents) {
    GURL gurl = params.url;
    if (!url_util::FixupGURL(gurl))
      return false;

    web_contents->GetController().LoadURL(
        gurl, params.referrer, params.transition, params.extra_headers);
    return true;
  }
  return false;
}

void CefBrowserHostBase::OnDidFinishLoad(CefRefPtr<CefFrameHostImpl> frame,
                                         const GURL& validated_url,
                                         int http_status_code) {
  frame->RefreshAttributes();

  contents_delegate_->OnLoadEnd(frame, validated_url, http_status_code);
}

void CefBrowserHostBase::ViewText(const std::string& text) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(CEF_UIT,
                  base::BindOnce(&CefBrowserHostBase::ViewText, this, text));
    return;
  }

  if (platform_delegate_)
    platform_delegate_->ViewText(text);
}

bool CefBrowserHostBase::MaybeAllowNavigation(
    content::RenderFrameHost* opener,
    bool is_guest_view,
    const content::OpenURLParams& params) {
  return true;
}

void CefBrowserHostBase::OnAfterCreated() {
  CEF_REQUIRE_UIT();
  if (client_) {
    if (auto handler = client_->GetLifeSpanHandler()) {
      handler->OnAfterCreated(this);
    }
  }
}

void CefBrowserHostBase::OnBeforeClose() {
  CEF_REQUIRE_UIT();
  if (client_) {
    if (auto handler = client_->GetLifeSpanHandler()) {
      handler->OnBeforeClose(this);
    }
  }
  browser_info_->SetClosing();
}

void CefBrowserHostBase::OnBrowserDestroyed() {
  CEF_REQUIRE_UIT();
  for (auto& observer : observers_)
    observer.OnBrowserDestroyed(this);
}

int CefBrowserHostBase::browser_id() const {
  return browser_info_->browser_id();
}

SkColor CefBrowserHostBase::GetBackgroundColor() const {
  // Don't use |platform_delegate_| because it's not thread-safe.
  return CefContext::Get()->GetBackgroundColor(
      &settings_, IsWindowless() ? STATE_ENABLED : STATE_DISABLED);
}

bool CefBrowserHostBase::IsWindowless() const {
  return false;
}

content::WebContents* CefBrowserHostBase::GetWebContents() const {
  CEF_REQUIRE_UIT();
  return contents_delegate_->web_contents();
}

content::BrowserContext* CefBrowserHostBase::GetBrowserContext() const {
  CEF_REQUIRE_UIT();
  auto web_contents = GetWebContents();
  if (web_contents)
    return web_contents->GetBrowserContext();
  return nullptr;
}

#if defined(TOOLKIT_VIEWS)
views::Widget* CefBrowserHostBase::GetWindowWidget() const {
  CEF_REQUIRE_UIT();
  if (!platform_delegate_)
    return nullptr;
  return platform_delegate_->GetWindowWidget();
}

CefRefPtr<CefBrowserView> CefBrowserHostBase::GetBrowserView() const {
  CEF_REQUIRE_UIT();
  if (is_views_hosted_ && platform_delegate_)
    return platform_delegate_->GetBrowserView();
  return nullptr;
}
#endif  // defined(TOOLKIT_VIEWS)

bool CefBrowserHostBase::EnsureDevToolsManager() {
  CEF_REQUIRE_UIT();
  if (!contents_delegate_->web_contents())
    return false;

  if (!devtools_manager_) {
    devtools_manager_.reset(new CefDevToolsManager(this));
  }
  return true;
}

void CefBrowserHostBase::InitializeDevToolsRegistrationOnUIThread(
    CefRefPtr<CefRegistration> registration) {
  if (!CEF_CURRENTLY_ON_UIT()) {
    CEF_POST_TASK(
        CEF_UIT,
        base::BindOnce(
            &CefBrowserHostBase::InitializeDevToolsRegistrationOnUIThread, this,
            registration));
    return;
  }

  if (!EnsureDevToolsManager())
    return;
  devtools_manager_->InitializeRegistrationOnUIThread(registration);
}