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

ash/common/wm/dock/docked_window_layout_manager.cc

 // Copyright (c) 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.
 
 #include "ash/common/wm/dock/docked_window_layout_manager.h"
 
 #include "ash/animation/animation_change_type.h"
 #include "ash/common/shelf/shelf_background_animator.h"
 #include "ash/common/shelf/shelf_background_animator_observer.h"
 #include "ash/common/shelf/shelf_constants.h"
@@ skipping 38 matching lines @@
 const int kFadeDurationMs = 60;
 const int kMinimizeDurationMs = 720;
 
 class DockedBackgroundWidget : public views::Widget,
                                public WmShelfObserver,
                                public ShelfBackgroundAnimatorObserver {
  public:
   explicit DockedBackgroundWidget(DockedWindowLayoutManager* manager)
       : manager_(manager),
         alignment_(DOCKED_ALIGNMENT_NONE),
-        background_animator_(SHELF_BACKGROUND_DEFAULT, nullptr),
+        background_animator_(SHELF_BACKGROUND_DEFAULT,
+                             nullptr,
+                             WmShell::Get()->wallpaper_controller()),
         opaque_background_(ui::LAYER_SOLID_COLOR),
         visible_background_type_(manager_->shelf()->GetBackgroundType()),
         visible_background_change_type_(AnimationChangeType::IMMEDIATE) {
     manager_->shelf()->AddObserver(this);
     InitWidget(manager_->dock_container());
 
     background_animator_.AddObserver(this);
   }
 
   ~DockedBackgroundWidget() override {
     background_animator_.RemoveObserver(this);
     manager_->shelf()->RemoveObserver(this);
   }
 
   // Sets widget bounds and sizes opaque background layer to fill the widget.
   void SetBackgroundBounds(const gfx::Rect& bounds, DockedAlignment alignment) {
     SetBounds(bounds);
     opaque_background_.SetBounds(gfx::Rect(bounds.size()));
     alignment_ = alignment;
   }
 
  private:
   // views::Widget:
   void OnNativeWidgetVisibilityChanged(bool visible) override {
     views::Widget::OnNativeWidgetVisibilityChanged(visible);
     UpdateBackground();
   }
 
   // ShelfBackgroundAnimatorObserver:
-  void UpdateShelfBackground(int alpha) override {
-    const float kMaxAlpha = 255.0f;
-    opaque_background_.SetOpacity(alpha / kMaxAlpha);
+  void UpdateShelfBackground(SkColor color) override {
+    opaque_background_.SetColor(color);
   }
 
   // WmShelfObserver:
   void OnBackgroundTypeChanged(ShelfBackgroundType background_type,
                                AnimationChangeType change_type) override {
     // Sets the background type. Starts an animation to transition to
     // |background_type| if the widget is visible. If the widget is not visible,
     // the animation is postponed till the widget becomes visible.
     visible_background_type_ = background_type;
     visible_background_change_type_ = change_type;
@@ skipping 1225 matching lines @@
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propagate automatically to this class, so manually recalculate bounds.
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::KEYBOARD_BOUNDS_CHANGING);
 }
 
 void DockedWindowLayoutManager::OnKeyboardClosed() {}
 
 }  // namespace ash