Allow dialogs to use a custom View as their title.

ui/views/bubble/bubble_dialog_delegate.h

Index: ui/views/bubble/bubble_dialog_delegate.h
diff --git a/ui/views/bubble/bubble_dialog_delegate.h b/ui/views/bubble/bubble_dialog_delegate.h
index e027988df18d514041e98681d6e540a69cbdd964..23b01d5c39ae3873da288a7bdbbfd59170ce01ab 100644
--- a/ui/views/bubble/bubble_dialog_delegate.h
+++ b/ui/views/bubble/bubble_dialog_delegate.h
@@ -15,7 +15,6 @@
 #include "ui/views/window/dialog_delegate.h"
 
 namespace gfx {
-class FontList;
 class Rect;
 }
 
@@ -48,6 +47,7 @@ class VIEWS_EXPORT BubbleDialogDelegateView : public DialogDelegateView,
   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;
@@ -130,9 +130,12 @@ class VIEWS_EXPORT BubbleDialogDelegateView : public DialogDelegateView,
   // 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;