Allow dialogs to use a custom View as their title.

ui/views/bubble/bubble_dialog_delegate.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_BUBBLE_BUBBLE_DIALOG_DELEGATE_H_
 #define UI_VIEWS_BUBBLE_BUBBLE_DIALOG_DELEGATE_H_
 
 #include <memory>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "ui/views/bubble/bubble_border.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_observer.h"
 #include "ui/views/window/dialog_delegate.h"
 
 namespace gfx {
-class FontList;
 class Rect;
 }
 
 namespace views {
 
 class BubbleFrameView;
 class ViewTracker;
 
 // BubbleDialogDelegateView is a special DialogDelegateView for bubbles.
 class VIEWS_EXPORT BubbleDialogDelegateView : public DialogDelegateView,
@@ skipping 12 matching lines @@
 
   // Create and initialize the bubble Widget(s) with proper bounds.
   static Widget* CreateBubble(BubbleDialogDelegateView* bubble_delegate);
 
   // WidgetDelegateView overrides:
   BubbleDialogDelegateView* AsBubbleDialogDelegate() override;
   bool ShouldShowCloseButton() const override;
   ClientView* CreateClientView(Widget* widget) override;
   NonClientFrameView* CreateNonClientFrameView(Widget* widget) override;
   const char* GetClassName() const override;
+  void AddedToWidget() override;
 
   // WidgetObserver overrides:
   void OnWidgetDestroying(Widget* widget) override;
   void OnWidgetVisibilityChanging(Widget* widget, bool visible) override;
   void OnWidgetVisibilityChanged(Widget* widget, bool visible) override;
   void OnWidgetActivationChanged(Widget* widget, bool active) override;
   void OnWidgetBoundsChanged(Widget* widget,
                              const gfx::Rect& new_bounds) override;
 
   bool close_on_deactivate() const { return close_on_deactivate_; }
@@ skipping 62 matching lines @@
   // bounds change as a result of the widget's bounds changing.
   void OnAnchorBoundsChanged();
 
  protected:
   BubbleDialogDelegateView();
   BubbleDialogDelegateView(View* anchor_view, BubbleBorder::Arrow arrow);
 
   // Get bubble bounds from the anchor rect and client view's preferred size.
   virtual gfx::Rect GetBubbleBounds();
 
-  // Return a FontList to use for the title of the bubble.
-  // (The default is MediumFont).
-  virtual const gfx::FontList& GetTitleFontList() const;
+  // Returns a custom view to use as the title of the dialog.
+  virtual View* CreateTitleView(const base::string16& title_text);
+
+  // Gives the custom title view returned from CreateTitleView, if there is one,
+  // to the BubbleFrameView.
+  void SetupTitleView();

[Peter Kasting, 2017/06/17 01:16:20]

Nit: "Setup" implied to me that I could only call this once, during startup. 
Maybe Update or Reset instead?

[Bret, 2017/06/21 22:37:54]

No longer relevant due to other changes.

 
   // View overrides:
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
 
   // Perform view initialization on the contents for bubble sizing.
   virtual void Init();
 
   // Sets the anchor view or rect and repositions the bubble. Note that if a
   // valid view gets passed, the anchor rect will get ignored. If the view gets
   // deleted, but no new view gets set, the last known anchor postion will get
@@ skipping 63 matching lines @@
 
   // Parent native window of the bubble.
   gfx::NativeView parent_window_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleDialogDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_BUBBLE_DELEGATE2_H_