[Mac] Use NSTitlebarAccessoryViewController to implement colored app window frames.

chrome/browser/ui/cocoa/apps/native_app_window_cocoa.h

 // Copyright 2013 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 CHROME_BROWSER_UI_COCOA_APPS_NATIVE_APP_WINDOW_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_APPS_NATIVE_APP_WINDOW_COCOA_H_
 
 #import <Cocoa/Cocoa.h>
 #include <vector>
 
@@ skipping 97 matching lines @@
   // Called when the window is un-minimized.
   void WindowDidDeminiaturize();
 
   // Called when the window is zoomed (maximized or de-maximized).
   void WindowWillZoom();
 
   // Called when the window enters fullscreen.
   void WindowDidEnterFullscreen();
 
   // Called when the window exits fullscreen.
+  void WindowWillExitFullscreen();
   void WindowDidExitFullscreen();
 
   // Called to handle a key event.
   bool HandledByExtensionCommand(
       NSEvent* event,
       ui::AcceleratorManager::HandlerPriority priority);
 
   // Returns true if |point| in local Cocoa coordinate system falls within
   // the draggable region.
   bool IsWithinDraggableRegion(NSPoint point) const;
@@ skipping 82 matching lines @@
   bool shows_fullscreen_controls_;
 
   extensions::SizeConstraints size_constraints_;
 
   bool has_frame_color_;
   SkColor active_frame_color_;
   SkColor inactive_frame_color_;
 
   base::scoped_nsobject<NativeAppWindowController> window_controller_;
   base::scoped_nsobject<TitlebarBackgroundView> titlebar_background_view_;
+  base::scoped_nsobject<id> titlebar_accessory_view_controller_;
 
   // For system drag, the whole window is draggable and the non-draggable areas
   // have to been explicitly excluded.
   std::vector<extensions::DraggableRegion> draggable_regions_;
 
   // The Extension Command Registry used to determine which keyboard events to
   // handle.
   scoped_ptr<ExtensionKeybindingRegistryCocoa> extension_keybinding_registry_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeAppWindowCocoa);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_APPS_NATIVE_APP_WINDOW_COCOA_H_