chrome: Add support for Alloy style browsers and windows (see #3681)

Split the Alloy runtime into bootstrap and style components. Support
creation of Alloy style browsers and windows with the Chrome runtime.
Chrome runtime (`--enable-chrome-runtime`) + Alloy style
(`--use-alloy-style`) supports Views (`--use-views`), native parent
(`--use-native`) and windowless rendering
(`--off-screen-rendering-enabled`).

Print preview is supported in all cases except with windowless rendering
on all platforms and native parent on MacOS. It is disabled by default
with Alloy style for legacy compatibility. Where supported it can be
enabled or disabled globally using `--[enable|disable]-print-preview` or
configured on a per-RequestContext basis using the
`printing.print_preview_disabled` preference. It also behaves as
expected when triggered via the PDF viewer print button.

Chrome runtime + Alloy style behavior differs from Alloy runtime in the
following significant ways:

- Supports Chrome error pages by default.
- DevTools popups are Chrome style only (cannot be windowless).
- The Alloy extension API will not supported.

Chrome runtime + Alloy style passes all expected Alloy ceftests except
the following:

- `DisplayTest.AutoResize` (Alloy extension API not supported)
- `DownloadTest.*` (Download API not yet supported)
- `ExtensionTest.*` (Alloy extension API not supported)

This change also adds Chrome runtime support for
CefContextMenuHandler::RunContextMenu (see #3293).

This change also explicitly blocks (and doesn't retry) FrameAttached
requests from PDF viewer and print preview excluded frames (see #3664).

Known issues specific to Chrome runtime + Alloy style:
- DevTools popup with windowless rendering doesn't load successfully.
  Use windowed rendering or remote debugging as a workaround.
- Chrome style Window with Alloy style BrowserView (`--use-alloy-style
  --use-chrome-style-window`) does not show Chrome theme changes.

To test:
- Run `ceftests --enable-chrome-runtime --use-alloy-style
       [--use-chrome-style-window] [--use-views|--use-native]
       --gtest_filter=...`
- Run `cefclient --enable-chrome-runtime --use-alloy-style
       [--use-chrome-style-window]
       [--use-views|--use-native|--off-screen-rendering-enabled]`
- Run `cefsimple --enable-chrome-runtime --use-alloy-style [--use-views]`

libcef/browser/alloy/alloy_browser_host_impl.cc

@@ -9,7 +9,6 @@
 #include <string>
 #include <utility>
 
-#include "libcef/browser/alloy/alloy_browser_context.h"
 #include "libcef/browser/alloy/browser_platform_delegate_alloy.h"
 #include "libcef/browser/audio_capturer.h"
 #include "libcef/browser/browser_context.h"
@@ -17,7 +16,6 @@
 #include "libcef/browser/browser_info_manager.h"
 #include "libcef/browser/browser_platform_delegate.h"
 #include "libcef/browser/context.h"
-#include "libcef/browser/devtools/devtools_manager.h"
 #include "libcef/browser/hang_monitor.h"
 #include "libcef/browser/media_access_query.h"
 #include "libcef/browser/osr/osr_util.h"
@@ -29,7 +27,7 @@
 #include "libcef/common/net/url_util.h"
 #include "libcef/common/request_impl.h"
 #include "libcef/common/values_impl.h"
-#include "libcef/features/runtime_checks.h"
+#include "libcef/features/runtime.h"
 
 #include "base/command_line.h"
 #include "base/functional/bind.h"
@@ -73,11 +71,15 @@ CefRefPtr<AlloyBrowserHostImpl> AlloyBrowserHostImpl::Create(
       CefBrowserPlatformDelegate::Create(create_params);
   CHECK(platform_delegate);
 
+  // Expect runtime style to match.
+  CHECK(platform_delegate->IsAlloyStyle());
+
   const bool is_devtools_popup = !!create_params.devtools_opener;
 
   scoped_refptr<CefBrowserInfo> info =
       CefBrowserInfoManager::GetInstance()->CreateBrowserInfo(
           is_devtools_popup, platform_delegate->IsWindowless(),
+          platform_delegate->IsPrintPreviewSupported(),
           create_params.extra_info);
 
   bool own_web_contents = false;
@@ -101,8 +103,7 @@ CefRefPtr<AlloyBrowserHostImpl> AlloyBrowserHostImpl::Create(
 
   CefRefPtr<AlloyBrowserHostImpl> browser = CreateInternal(
       create_params.settings, create_params.client, web_contents,
-      own_web_contents, info,
-      static_cast<AlloyBrowserHostImpl*>(create_params.devtools_opener.get()),
+      own_web_contents, info, FromBaseChecked(create_params.devtools_opener),
       is_devtools_popup, request_context_impl, std::move(platform_delegate),
       cef_extension);
   if (!browser) {
@@ -181,8 +182,8 @@ CefRefPtr<AlloyBrowserHostImpl> AlloyBrowserHostImpl::CreateInternal(
     // 1. Notify the opener browser's platform delegate. With Views this will
     // result in a call to CefBrowserViewDelegate::OnPopupBrowserViewCreated().
     // Do this first for consistency with the Chrome runtime.
-    opener->platform_delegate_->PopupBrowserCreated(browser.get(),
-                                                    is_devtools_popup);
+    opener->platform_delegate_->PopupBrowserCreated(
+        browser->platform_delegate(), browser.get(), is_devtools_popup);
   }
 
   // 2. Notify the browser's LifeSpanHandler. This must always be the first
@@ -200,36 +201,38 @@ CefRefPtr<AlloyBrowserHostImpl> AlloyBrowserHostImpl::CreateInternal(
   return browser;
 }
 
+// static
+CefRefPtr<AlloyBrowserHostImpl> AlloyBrowserHostImpl::FromBaseChecked(
+    CefRefPtr<CefBrowserHostBase> host_base) {
+  if (!host_base) {
+    return nullptr;
+  }
+  CHECK(host_base->IsAlloyStyle());
+  return static_cast<AlloyBrowserHostImpl*>(host_base.get());
+}
+
 // static
 CefRefPtr<AlloyBrowserHostImpl> AlloyBrowserHostImpl::GetBrowserForHost(
     const content::RenderViewHost* host) {
-  REQUIRE_ALLOY_RUNTIME();
-  auto browser = CefBrowserHostBase::GetBrowserForHost(host);
-  return static_cast<AlloyBrowserHostImpl*>(browser.get());
+  return FromBaseChecked(CefBrowserHostBase::GetBrowserForHost(host));
 }
 
 // static
 CefRefPtr<AlloyBrowserHostImpl> AlloyBrowserHostImpl::GetBrowserForHost(
     const content::RenderFrameHost* host) {
-  REQUIRE_ALLOY_RUNTIME();
-  auto browser = CefBrowserHostBase::GetBrowserForHost(host);
-  return static_cast<AlloyBrowserHostImpl*>(browser.get());
+  return FromBaseChecked(CefBrowserHostBase::GetBrowserForHost(host));
 }
 
 // static
 CefRefPtr<AlloyBrowserHostImpl> AlloyBrowserHostImpl::GetBrowserForContents(
     const content::WebContents* contents) {
-  REQUIRE_ALLOY_RUNTIME();
-  auto browser = CefBrowserHostBase::GetBrowserForContents(contents);
-  return static_cast<AlloyBrowserHostImpl*>(browser.get());
+  return FromBaseChecked(CefBrowserHostBase::GetBrowserForContents(contents));
 }
 
 // static
 CefRefPtr<AlloyBrowserHostImpl> AlloyBrowserHostImpl::GetBrowserForGlobalId(
     const content::GlobalRenderFrameHostId& global_id) {
-  REQUIRE_ALLOY_RUNTIME();
-  auto browser = CefBrowserHostBase::GetBrowserForGlobalId(global_id);
-  return static_cast<AlloyBrowserHostImpl*>(browser.get());
+  return FromBaseChecked(CefBrowserHostBase::GetBrowserForGlobalId(global_id));
 }
 
 // AlloyBrowserHostImpl methods.
@@ -333,42 +336,6 @@ void AlloyBrowserHostImpl::StopFinding(bool clearSelection) {
   }
 }
 
-void AlloyBrowserHostImpl::ShowDevToolsOnUIThread(
-    std::unique_ptr<CefShowDevToolsParams> params) {
-  CEF_REQUIRE_UIT();
-  if (!EnsureDevToolsManager()) {
-    return;
-  }
-  devtools_manager_->ShowDevTools(params->window_info_, params->client_,
-                                  params->settings_,
-                                  params->inspect_element_at_);
-}
-
-void AlloyBrowserHostImpl::CloseDevTools() {
-  if (!CEF_CURRENTLY_ON_UIT()) {
-    CEF_POST_TASK(CEF_UIT,
-                  base::BindOnce(&AlloyBrowserHostImpl::CloseDevTools, this));
-    return;
-  }
-
-  if (!devtools_manager_) {
-    return;
-  }
-  devtools_manager_->CloseDevTools();
-}
-
-bool AlloyBrowserHostImpl::HasDevTools() {
-  if (!CEF_CURRENTLY_ON_UIT()) {
-    DCHECK(false) << "called on invalid thread";
-    return false;
-  }
-
-  if (!devtools_manager_) {
-    return false;
-  }
-  return devtools_manager_->HasDevTools();
-}
-
 void AlloyBrowserHostImpl::SetAutoResizeEnabled(bool enabled,
                                                 const CefSize& min_size,
                                                 const CefSize& max_size) {
@@ -636,8 +603,10 @@ void AlloyBrowserHostImpl::CancelContextMenu() {
 
 bool AlloyBrowserHostImpl::MaybeAllowNavigation(
     content::RenderFrameHost* opener,
-    bool is_guest_view,
     const content::OpenURLParams& params) {
+  bool is_guest_view = false;
+  GetFrameForHost(opener, &is_guest_view);
+
   if (is_guest_view && !params.is_pdf &&
       !params.url.SchemeIs(extensions::kExtensionScheme) &&
       !params.url.SchemeIs(content::kChromeUIScheme)) {
@@ -1175,7 +1144,8 @@ void AlloyBrowserHostImpl::WebContentsCreated(
 
   scoped_refptr<CefBrowserInfo> info =
       CefBrowserInfoManager::GetInstance()->CreatePopupBrowserInfo(
-          new_contents, platform_delegate->IsWindowless(), extra_info);
+          new_contents, platform_delegate->IsWindowless(),
+          platform_delegate->IsPrintPreviewSupported(), extra_info);
   CHECK(info.get());
   CHECK(info->is_popup());
 
@@ -1303,8 +1273,8 @@ void AlloyBrowserHostImpl::ExitPictureInPicture() {
 }
 
 bool AlloyBrowserHostImpl::IsBackForwardCacheSupported() {
-  // Disabled due to issue #3237.
-  return false;
+  // Disabled with Alloy bootstrap due to issue #3237.
+  return cef::IsChromeRuntimeEnabled();
 }
 
 content::PreloadingEligibility AlloyBrowserHostImpl::IsPrerender2Supported(
@@ -1318,11 +1288,12 @@ content::PreloadingEligibility AlloyBrowserHostImpl::IsPrerender2Supported(
 void AlloyBrowserHostImpl::DidFinishNavigation(
     content::NavigationHandle* navigation_handle) {
   if (web_contents()) {
-    auto cef_browser_context =
-        static_cast<AlloyBrowserContext*>(web_contents()->GetBrowserContext());
+    auto cef_browser_context = CefBrowserContext::FromBrowserContext(
+        web_contents()->GetBrowserContext());
     if (cef_browser_context) {
       cef_browser_context->AddVisitedURLs(
-          navigation_handle->GetRedirectChain());
+          navigation_handle->GetURL(), navigation_handle->GetRedirectChain(),
+          navigation_handle->GetPageTransition());
     }
   }
 }