Add ink drop ripple to status tray

ash/common/system/tray/tray_background_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_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/shelf/shelf_background_animator_observer.h"
 #include "ash/common/system/tray/actionable_view.h"
 #include "ash/public/cpp/shelf_types.h"
 #include "base/macros.h"
 #include "ui/compositor/layer_animation_observer.h"
+#include "ui/gfx/geometry/insets.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 
 namespace ash {
 class ShelfLayoutManager;
 class TrayEventFilter;
 class TrayBackground;
 class WmShelf;
 
 // Base class for children of StatusAreaWidget: SystemTray, WebNotificationTray,
 // LogoutButtonTray, OverviewButtonTray.
@@ skipping 125 matching lines @@
   class TrayWidgetObserver;
 
   // ui::ImplicitAnimationObserver:
   void OnImplicitAnimationsCompleted() override;
   bool RequiresNotificationWhenAnimatorDestroyed() const override;
 
   // Applies transformations to the |layer()| to animate the view when
   // SetVisible(false) is called.
   void HideTransformation();
 
+  // Helper function that calculates background insets relative to local bounds.
+  gfx::Insets GetBackgroundInsets() const;
+
+  // Helper function that calculates ink drop bounds relative to local bounds
+  // based on the background insets returned from GetBackgroundInsets().
+  gfx::Rect GetInkDropBounds() const;
+
   // The shelf containing the system tray for this view.
   WmShelf* wm_shelf_;
 
   // Convenience pointer to the contents view.
   TrayContainer* tray_container_;
 
   // Shelf alignment.
   // TODO(jamescook): Don't cache this, get it from WmShelf.
   ShelfAlignment shelf_alignment_;
 
@@ skipping 10 matching lines @@
 
   std::unique_ptr<TrayWidgetObserver> widget_observer_;
   std::unique_ptr<TrayEventFilter> tray_event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBackgroundView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_