Fix the issue of app window frame header buttons not being repainted when its activation state chan…

ash/frame/custom_frame_view_ash.h

 // Copyright (c) 2012 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 ASH_FRAME_CUSTOM_FRAME_VIEW_ASH_H_
 #define ASH_FRAME_CUSTOM_FRAME_VIEW_ASH_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 40 matching lines @@
   // views::NonClientFrameView:
   gfx::Rect GetBoundsForClientView() const override;
   gfx::Rect GetWindowBoundsForClientBounds(
       const gfx::Rect& client_bounds) const override;
   int NonClientHitTest(const gfx::Point& point) override;
   void GetWindowMask(const gfx::Size& size, gfx::Path* window_mask) override;
   void ResetWindowControls() override;
   void UpdateWindowIcon() override;
   void UpdateWindowTitle() override;
   void SizeConstraintsChanged() override;
+  void ActivationChanged(bool active) override;
 
   // views::View:
   gfx::Size GetPreferredSize() const override;
   void Layout() override;
   const char* GetClassName() const override;
   gfx::Size GetMinimumSize() const override;
   gfx::Size GetMaximumSize() const override;
   void SchedulePaintInRect(const gfx::Rect& r) override;
   void VisibilityChanged(views::View* starting_from, bool is_visible) override;
 
@@ skipping 27 matching lines @@
   // Updates the hittest bounds overrides based on the window state type.
   std::unique_ptr<FrameBorderHitTestController>
       frame_border_hit_test_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(CustomFrameViewAsh);
 };
 
 }  // namespace ash
 
 #endif  // ASH_FRAME_CUSTOM_FRAME_VIEW_ASH_H_