Use light images in colored app frames, when the frame color is dark.

apps/ui/views/app_window_frame_view.h

 // Copyright 2014 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 APPS_UI_VIEWS_APP_WINDOW_FRAME_VIEW_H_
 #define APPS_UI_VIEWS_APP_WINDOW_FRAME_VIEW_H_
 
 #include <string>
 
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 70 matching lines @@
   virtual void Layout() OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual gfx::Size GetMinimumSize() OVERRIDE;
   virtual gfx::Size GetMaximumSize() OVERRIDE;
 
   // views::ButtonListener implementation.
   virtual void ButtonPressed(views::Button* sender,
                              const ui::Event& event) OVERRIDE;
 
+  // Some button images we use depend on the color of the frame. This
+  // will set these images based on the color of the frame.
+  void SetButtonImagesForFrame();
+
+  // Return the current frame color based on the active state of the window.
+  SkColor CurrentFrameColor();
+
   views::Widget* widget_;
   NativeAppWindow* window_;
   bool draw_frame_;
   SkColor active_frame_color_;
   SkColor inactive_frame_color_;
   views::ImageButton* close_button_;
   views::ImageButton* maximize_button_;
   views::ImageButton* restore_button_;
   views::ImageButton* minimize_button_;
 
   // Allow resize for clicks this many pixels inside the bounds.
   int resize_inside_bounds_size_;
 
   // Allow resize for clicks  this many pixels outside the bounds.
   int resize_outside_bounds_size_;
 
   // Size in pixels of the lower-right corner resize handle.
   int resize_area_corner_size_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindowFrameView);
 };
 
 }  // namespace apps
 
 #endif  // APPS_UI_VIEWS_APP_WINDOW_FRAME_VIEW_H_