Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ash/system/tray/tray_background_view.cc

 // 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.
 
 #include "ash/system/tray/tray_background_view.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/tray_constants.h"
@@ skipping 79 matching lines @@
  public:
   const static int kImageTypeDefault = 0;
   const static int kImageTypeOnBlack = 1;
   const static int kImageTypePressed = 2;
   const static int kNumStates = 3;
 
   const static int kImageHorizontal = 0;
   const static int kImageVertical = 1;
   const static int kNumOrientations = 2;
 
-  explicit TrayBackground(TrayBackgroundView* tray_background_view) :
-      tray_background_view_(tray_background_view) {
-  }
+  explicit TrayBackground(TrayBackgroundView* tray_background_view)
+      : tray_background_view_(tray_background_view), alpha_(0) {}
 
   ~TrayBackground() override {}
 
+  void set_alpha(int alpha) { alpha_ = alpha; }
+
  private:
   ShelfWidget* GetShelfWidget() const {
     return tray_background_view_->GetShelfLayoutManager()->shelf_widget();
   }
 
   void PaintMaterial(gfx::Canvas* canvas, views::View* view) const {
-    SkColor color = SK_ColorTRANSPARENT;
-    ShelfWidget* shelf_widget = GetShelfWidget();
+    SkColor color = SkColorSetA(kShelfBaseColor, alpha_);
     if (tray_background_view_->draw_background_as_active()) {
       // TODO(bruthig|mohsen): Use of this color is temporary. Draw the active
       // state using the material design ripple animation.
       color = SK_ColorBLUE;
-    } else if (shelf_widget &&
-               shelf_widget->GetBackgroundType() ==
-                   ShelfBackgroundType::SHELF_BACKGROUND_DEFAULT) {
-      color = SkColorSetA(kShelfBaseColor,
-                          GetShelfConstant(SHELF_BACKGROUND_ALPHA));
     }
 
     // TODO(bruthig|tdanderson): The background should be changed using a
     // fade in/out animation.
     const int kCornerRadius = 2;
     SkPaint paint;
     paint.setFlags(SkPaint::kAntiAlias_Flag);
     paint.setColor(color);
     canvas->DrawRoundRect(view->GetLocalBounds(), kCornerRadius, paint);
   }
@@ skipping 36 matching lines @@
   void Paint(gfx::Canvas* canvas, views::View* view) const override {
     if (MaterialDesignController::IsShelfMaterial())
       PaintMaterial(canvas, view);
     else
       PaintNonMaterial(canvas, view);
   }
 
   // Reference to the TrayBackgroundView for which this is a background.
   TrayBackgroundView* tray_background_view_;
 
+  int alpha_;
+
   DISALLOW_COPY_AND_ASSIGN(TrayBackground);
 };
 
 TrayBackgroundView::TrayContainer::TrayContainer(ShelfAlignment alignment)
     : alignment_(alignment) {
   UpdateLayout();
 }
 
 void TrayBackgroundView::TrayContainer::SetAlignment(ShelfAlignment alignment) {
   if (alignment_ == alignment)
@@ skipping 182 matching lines @@
     if (event->type() == ui::ET_GESTURE_TAP_DOWN) {
       SetDrawBackgroundAsActive(true);
     } else if (event->type() ==  ui::ET_GESTURE_SCROLL_BEGIN ||
                event->type() ==  ui::ET_GESTURE_TAP_CANCEL) {
       SetDrawBackgroundAsActive(false);
     }
   }
   ActionableView::OnGestureEvent(event);
 }
 
-void TrayBackgroundView::UpdateBackground(int alpha) {
-  // The animator should never fire when the alternate shelf layout is used.

[James Cook, 2016/06/14 17:50:02]

Hooray for eliminating old "alternate shelf layout" code!

-  if (!background_ || draw_background_as_active_)
-    return;
-  SchedulePaint();
-}
-
 void TrayBackgroundView::SetContents(views::View* contents) {
   SetLayoutManager(new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));
   AddChildView(contents);
 }
 void TrayBackgroundView::SetContentsBackground() {
   background_ = new TrayBackground(this);
   tray_container_->set_background(background_);
 }
 
 ShelfLayoutManager* TrayBackgroundView::GetShelfLayoutManager() {
@@ skipping 168 matching lines @@
   if (!background_)
     return;
   SchedulePaint();
 }
 
 void TrayBackgroundView::UpdateBubbleViewArrow(
     views::TrayBubbleView* bubble_view) {
   // Nothing to do here.
 }
 
+void TrayBackgroundView::UpdateShelfItemBackground(int alpha) {
+  if (background_)
+    background_->set_alpha(alpha);
+  SchedulePaint();
+}
+
 }  // namespace ash