Make panel window's header color customizable in Ash.

ash/wm/panels/panel_frame_view.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_WM_PANELS_PANEL_FRAME_VIEW_H_
 #define ASH_WM_PANELS_PANEL_FRAME_VIEW_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "ui/views/window/non_client_view.h"
@@ skipping 13 matching lines @@
   static const char kViewClassName[];
 
   enum FrameType {
     FRAME_NONE,
     FRAME_ASH
   };
 
   PanelFrameView(views::Widget* frame, FrameType frame_type);
   ~PanelFrameView() override;
 
+  // Sets the active and inactive frame colors. Note the inactive frame color
+  // will have some transparency added when the frame is drawn.
+  void SetFrameColors(SkColor active_frame_color, SkColor inactive_frame_color);
+
   // Overridden from views::View:
   const char* GetClassName() const override;
 
  private:
   void InitHeaderPainter();
 
   // Height from top of window to top of client area.
   int NonClientTopBorderHeight() const;
 
   // Overridden from views::NonClientFrameView:
@@ skipping 24 matching lines @@
 
   // Updates the hittest bounds overrides based on the window state type.
   scoped_ptr<FrameBorderHitTestController> frame_border_hit_test_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelFrameView);
 };
 
 }
 
 #endif // ASH_WM_PANELS_PANEL_FRAME_VIEW_H_