[ash-md] Updated the overflow shelf to change colors based on the wallpaper.

ash/shelf/overflow_bubble_view.cc

 // Copyright 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/shelf/overflow_bubble_view.h"
 
 #include <algorithm>
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/wm_shelf.h"
+#include "ash/shell.h"
 #include "ash/wm_window.h"
 #include "base/i18n/rtl.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/events/event.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/views/bubble/bubble_frame_view.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace {
 
 // Padding at the two ends of the bubble.
 const int kEndPadding = 16;
 
 // Distance between overflow bubble and the main shelf.
 const int kDistanceToMainShelf = 4;
 
-constexpr SkColor kBackgroundColor =
-    SkColorSetA(kShelfDefaultBaseColor, kShelfTranslucentAlpha);
-
 }  // namespace
 
 OverflowBubbleView::OverflowBubbleView(WmShelf* wm_shelf)
-    : wm_shelf_(wm_shelf), shelf_view_(nullptr) {
+    : wm_shelf_(wm_shelf),
+      shelf_view_(nullptr),
+      background_animator_(SHELF_BACKGROUND_OVERLAP,
+                           // Don't pass the WmShelf so the translucent color is
+                           // always used.
+                           nullptr,
+                           Shell::Get()->wallpaper_controller()) {
   DCHECK(wm_shelf_);
+
+  background_animator_.AddObserver(this);
 }
 
-OverflowBubbleView::~OverflowBubbleView() {}
+OverflowBubbleView::~OverflowBubbleView() {
+  background_animator_.RemoveObserver(this);
+}
 
 void OverflowBubbleView::InitOverflowBubble(views::View* anchor,
                                             views::View* shelf_view) {
   shelf_view_ = shelf_view;
 
   SetAnchorView(anchor);
   set_arrow(views::BubbleBorder::NONE);
   set_background(nullptr);
-  set_color(kBackgroundColor);
   if (wm_shelf_->IsHorizontalAlignment())
     set_margins(gfx::Insets(0, kEndPadding));
   else
     set_margins(gfx::Insets(kEndPadding, 0));
   set_shadow(views::BubbleBorder::NO_ASSETS);
   // Overflow bubble should not get focus. If it get focus when it is shown,
   // active state item is changed to running state.
   set_can_activate(false);
 
   // Makes bubble view has a layer and clip its children layers.
@@ skipping 128 matching lines @@
     bounds.set_x(anchor_rect.right() + kDistanceToMainShelf);
   else
     bounds.set_x(anchor_rect.x() - kDistanceToMainShelf - content_size.width());
   if (bounds.y() < monitor_rect.y())
     bounds.Offset(0, monitor_rect.y() - bounds.y());
   else if (bounds.bottom() > monitor_rect.bottom())
     bounds.Offset(monitor_rect.bottom() - bounds.bottom(), 0);
   return bounds;
 }
 
+void OverflowBubbleView::UpdateShelfBackground(SkColor color) {
+  set_color(color);
+}
+
 }  // namespace ash