views: Add support for absolute positioned overlay views.

To test:
Run `cefclient.exe --use-views --hide-frame --hide-controls`
Add `--enable-chrome-runtime` for the same behavior using the Chrome location
bar instead of a text field.

patch/patches/chrome_runtime_views.patch

@@ -1,5 +1,5 @@
 diff --git chrome/browser/ui/browser_command_controller.cc chrome/browser/ui/browser_command_controller.cc
-index 9188154824c4d..d01f610a64135 100644
+index 9188154824c4..d01f610a6413 100644
 --- chrome/browser/ui/browser_command_controller.cc
 +++ chrome/browser/ui/browser_command_controller.cc
 @@ -351,8 +351,10 @@ bool BrowserCommandController::ExecuteCommandWithDisposition(
@@ -31,7 +31,7 @@ index 9188154824c4d..d01f610a64135 100644
  
  void BrowserCommandController::InitCommandState() {
 diff --git chrome/browser/ui/views/frame/browser_frame.cc chrome/browser/ui/views/frame/browser_frame.cc
-index 2c4624fb0cd05..57c087dcbaaee 100644
+index 2c4624fb0cd0..57c087dcbaae 100644
 --- chrome/browser/ui/views/frame/browser_frame.cc
 +++ chrome/browser/ui/views/frame/browser_frame.cc
 @@ -69,15 +69,23 @@ bool IsUsingGtkTheme(Profile* profile) {
@@ -106,7 +106,7 @@ index 2c4624fb0cd05..57c087dcbaaee 100644
      // or not we always use the dark ui instance.
      if (base::FeatureList::IsEnabled(
 diff --git chrome/browser/ui/views/frame/browser_frame.h chrome/browser/ui/views/frame/browser_frame.h
-index 0ce7abdeb7d9f..8197a6bb7da98 100644
+index 0ce7abdeb7d9..8197a6bb7da9 100644
 --- chrome/browser/ui/views/frame/browser_frame.h
 +++ chrome/browser/ui/views/frame/browser_frame.h
 @@ -54,7 +54,9 @@ enum class TabDragKind {
@@ -120,10 +120,25 @@ index 0ce7abdeb7d9f..8197a6bb7da98 100644
  
    // Initialize the frame (creates the underlying native window).
 diff --git chrome/browser/ui/views/frame/browser_view.cc chrome/browser/ui/views/frame/browser_view.cc
-index f0b0bd645a3ce..0d8475b411512 100644
+index f0b0bd645a3c..ae1449aa9986 100644
 --- chrome/browser/ui/views/frame/browser_view.cc
 +++ chrome/browser/ui/views/frame/browser_view.cc
-@@ -593,11 +593,22 @@ class BrowserView::AccessibilityModeObserver : public ui::AXModeObserver {
+@@ -274,11 +274,10 @@ using content::WebContents;
+ using views::ColumnSet;
+ using web_modal::WebContentsModalDialogHost;
+ 
+-namespace {
++// static
++const char BrowserView::kBrowserViewKey[] = "__BROWSER_VIEW__";
+ 
+-// The name of a key to store on the window handle so that other code can
+-// locate this object using just the handle.
+-const char* const kBrowserViewKey = "__BROWSER_VIEW__";
++namespace {
+ 
+ #if BUILDFLAG(IS_CHROMEOS_ASH)
+ // UMA histograms that record animation smoothness for tab loading animation.
+@@ -593,11 +592,22 @@ class BrowserView::AccessibilityModeObserver : public ui::AXModeObserver {
  ///////////////////////////////////////////////////////////////////////////////
  // BrowserView, public:
  
@@ -147,7 +162,7 @@ index f0b0bd645a3ce..0d8475b411512 100644
    SetShowIcon(::ShouldShowWindowIcon(browser_.get()));
  
    // In forced app mode, all size controls are always disabled. Otherwise, use
-@@ -611,7 +622,6 @@ BrowserView::BrowserView(std::unique_ptr<Browser> browser)
+@@ -611,7 +621,6 @@ BrowserView::BrowserView(std::unique_ptr<Browser> browser)
    }
  
    browser_->tab_strip_model()->AddObserver(this);
@@ -155,7 +170,7 @@ index f0b0bd645a3ce..0d8475b411512 100644
  
    // Top container holds tab strip region and toolbar and lives at the front of
    // the view hierarchy.
-@@ -655,8 +665,15 @@ BrowserView::BrowserView(std::unique_ptr<Browser> browser)
+@@ -655,8 +664,15 @@ BrowserView::BrowserView(std::unique_ptr<Browser> browser)
    contents_container->SetLayoutManager(std::make_unique<ContentsLayoutManager>(
        devtools_web_view_, contents_web_view_));
  
@@ -173,7 +188,7 @@ index f0b0bd645a3ce..0d8475b411512 100644
  
    contents_separator_ =
        top_container_->AddChildView(std::make_unique<ContentsSeparator>());
-@@ -1440,6 +1457,8 @@ bool BrowserView::ShouldHideUIForFullscreen() const {
+@@ -1440,6 +1456,8 @@ bool BrowserView::ShouldHideUIForFullscreen() const {
    if (immersive_mode_controller_->IsEnabled())
      return false;
  
@@ -182,7 +197,7 @@ index f0b0bd645a3ce..0d8475b411512 100644
    return frame_->GetFrameView()->ShouldHideTopUIForFullscreen();
  }
  
-@@ -2482,7 +2501,8 @@ BrowserView::GetNativeViewHostsForTopControlsSlide() const {
+@@ -2482,7 +2500,8 @@ BrowserView::GetNativeViewHostsForTopControlsSlide() const {
  }
  
  void BrowserView::ReparentTopContainerForEndOfImmersive() {
@@ -192,7 +207,7 @@ index f0b0bd645a3ce..0d8475b411512 100644
    top_container()->DestroyLayer();
    AddChildViewAt(top_container(), 0);
    EnsureFocusOrder();
-@@ -2934,8 +2954,10 @@ void BrowserView::Layout() {
+@@ -2934,8 +2953,10 @@ void BrowserView::Layout() {
  
    // TODO(jamescook): Why was this in the middle of layout code?
    toolbar_->location_bar()->omnibox_view()->SetFocusBehavior(
@@ -205,7 +220,7 @@ index f0b0bd645a3ce..0d8475b411512 100644
  
    // Some of the situations when the BrowserView is laid out are:
    // - Enter/exit immersive fullscreen mode.
-@@ -2998,6 +3020,11 @@ void BrowserView::AddedToWidget() {
+@@ -2998,6 +3019,11 @@ void BrowserView::AddedToWidget() {
    SetThemeProfileForWindow(GetNativeWindow(), browser_->profile());
  #endif
  
@@ -217,7 +232,7 @@ index f0b0bd645a3ce..0d8475b411512 100644
    toolbar_->Init();
  
  #if BUILDFLAG(IS_CHROMEOS_ASH) || BUILDFLAG(IS_CHROMEOS_LACROS)
-@@ -3033,13 +3060,9 @@ void BrowserView::AddedToWidget() {
+@@ -3033,13 +3059,9 @@ void BrowserView::AddedToWidget() {
  
    EnsureFocusOrder();
  
@@ -234,10 +249,10 @@ index f0b0bd645a3ce..0d8475b411512 100644
  
    MaybeInitializeWebUITabStrip();
 diff --git chrome/browser/ui/views/frame/browser_view.h chrome/browser/ui/views/frame/browser_view.h
-index 021f04720e567..8c4f2cbf34f25 100644
+index 021f04720e56..98097fd4f11f 100644
 --- chrome/browser/ui/views/frame/browser_view.h
 +++ chrome/browser/ui/views/frame/browser_view.h
-@@ -114,7 +114,9 @@ class BrowserView : public BrowserWindow,
+@@ -114,11 +114,16 @@ class BrowserView : public BrowserWindow,
                      public webapps::AppBannerManager::Observer {
   public:
    METADATA_HEADER(BrowserView);
@@ -247,7 +262,14 @@ index 021f04720e567..8c4f2cbf34f25 100644
    BrowserView(const BrowserView&) = delete;
    BrowserView& operator=(const BrowserView&) = delete;
    ~BrowserView() override;
-@@ -668,6 +670,12 @@ class BrowserView : public BrowserWindow,
+ 
++  // Key used to bind BrowserView to the Widget with which it is associated.
++  static const char kBrowserViewKey[];
++
+   void set_frame(BrowserFrame* frame) { frame_ = frame; }
+   BrowserFrame* frame() const { return frame_; }
+ 
+@@ -668,6 +673,12 @@ class BrowserView : public BrowserWindow,
      return accessibility_focus_highlight_.get();
    }
  
@@ -261,15 +283,25 @@ index 021f04720e567..8c4f2cbf34f25 100644
    // Do not friend BrowserViewLayout. Use the BrowserViewLayoutDelegate
    // interface to keep these two classes decoupled and testable.
 diff --git chrome/browser/ui/views/frame/browser_view_layout.cc chrome/browser/ui/views/frame/browser_view_layout.cc
-index 18a85f436bd97..0d6e4c9f916e7 100644
+index 18a85f436bd9..cf880936a8ed 100644
 --- chrome/browser/ui/views/frame/browser_view_layout.cc
 +++ chrome/browser/ui/views/frame/browser_view_layout.cc
-@@ -441,6 +441,12 @@ int BrowserViewLayout::LayoutWebUITabStrip(int top) {
+@@ -39,6 +39,10 @@
+ #include "ui/views/widget/widget.h"
+ #include "ui/views/window/client_view.h"
+ 
++#if BUILDFLAG(ENABLE_CEF)
++#include "cef/libcef/browser/chrome/views/chrome_views_util.h"
++#endif
++
+ using views::View;
+ using web_modal::WebContentsModalDialogHost;
+ using web_modal::ModalDialogHostObserver;
+@@ -441,6 +445,11 @@ int BrowserViewLayout::LayoutWebUITabStrip(int top) {
  
  int BrowserViewLayout::LayoutToolbar(int top) {
    TRACE_EVENT0("ui", "BrowserViewLayout::LayoutToolbar");
-+  if (toolbar_->parent() && toolbar_->parent()->GetLayoutManager() != this &&
-+      toolbar_->parent()->GetLayoutManager() != nullptr) {
++  if (cef::IsCefView(toolbar_)) {
 +    // CEF may take ownership of the toolbar. Early exit to avoid the DCHECK
 +    // in LayoutManager::SetViewVisibility().
 +    return top;
@@ -278,7 +310,7 @@ index 18a85f436bd97..0d6e4c9f916e7 100644
    bool toolbar_visible = delegate_->IsToolbarVisible();
    int height = toolbar_visible ? toolbar_->GetPreferredSize().height() : 0;
 diff --git chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
-index 5e516ea5873ca..b9890fbe050af 100644
+index 5e516ea5873c..b9890fbe050a 100644
 --- chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
 +++ chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
 @@ -587,37 +587,53 @@ gfx::Range BrowserTabStripController::ListTabsInGroup(
@@ -336,7 +368,7 @@ index 5e516ea5873ca..b9890fbe050af 100644
  }
  
 diff --git chrome/browser/ui/views/toolbar/toolbar_view.cc chrome/browser/ui/views/toolbar/toolbar_view.cc
-index 7bc5cd3dabf7d..ea706584db609 100644
+index 7bc5cd3dabf7..ea706584db60 100644
 --- chrome/browser/ui/views/toolbar/toolbar_view.cc
 +++ chrome/browser/ui/views/toolbar/toolbar_view.cc
 @@ -162,12 +162,13 @@ auto& GetViewCommandMap() {
@@ -365,7 +397,7 @@ index 7bc5cd3dabf7d..ea706584db609 100644
    size_animation_.Reset(1);
  
 diff --git chrome/browser/ui/views/toolbar/toolbar_view.h chrome/browser/ui/views/toolbar/toolbar_view.h
-index 8346b612cfbe6..d7fc5440af829 100644
+index 8346b612cfbe..d7fc5440af82 100644
 --- chrome/browser/ui/views/toolbar/toolbar_view.h
 +++ chrome/browser/ui/views/toolbar/toolbar_view.h
 @@ -90,7 +90,8 @@ class ToolbarView : public views::AccessiblePaneView,