[ash-md] Wired in the Shelf color to be derived from the Wallpaper.

ash/common/shelf/shelf_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_COMMON_SHELF_SHELF_VIEW_H_
 #define ASH_COMMON_SHELF_SHELF_VIEW_H_
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "ash/common/shelf/ink_drop_button_listener.h"
 #include "ash/common/shelf/shelf_button_pressed_metric_tracker.h"
 #include "ash/common/shelf/shelf_item_delegate.h"
 #include "ash/common/shelf/shelf_model_observer.h"
 #include "ash/common/shelf/shelf_tooltip_manager.h"
 #include "base/macros.h"
+#include "third_party/skia/include/core/SkColor.h"
 #include "ui/app_list/views/app_list_drag_and_drop_host.h"
 #include "ui/views/animation/bounds_animator_observer.h"
 #include "ui/views/animation/ink_drop_state.h"
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/view.h"
 #include "ui/views/view_model.h"
 
 namespace ui {
@@ skipping 121 matching lines @@
                               Pointer pointer,
                               const ui::LocatedEvent& event);
   void PointerDraggedOnButton(views::View* view,
                               Pointer pointer,
                               const ui::LocatedEvent& event);
   void PointerReleasedOnButton(views::View* view,
                                Pointer pointer,
                                bool canceled);
 
   // Updates the background for the shelf items.
-  void UpdateShelfItemBackground(int alpha);
+  void UpdateShelfItemBackground(SkColor color);
 
   // Return the view model for test purposes.
   const views::ViewModel* view_model_for_test() const {
     return view_model_.get();
   }
 
  private:
   friend class ash::test::ShelfViewTestAPI;
 
   class FadeOutAnimationDelegate;
@@ skipping 289 matching lines @@
 
   // Tracks UMA metrics based on shelf button press actions.
   ShelfButtonPressedMetricTracker shelf_button_pressed_metric_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_SHELF_VIEW_H_