Add ink drop masking to TrayBackgroundView

ui/views/animation/ink_drop_host_view.h

 // Copyright 2016 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 UI_VIEWS_ANIMATION_INK_DROP_HOST_VIEW_H_
 #define UI_VIEWS_ANIMATION_INK_DROP_HOST_VIEW_H_
 
 #include <memory>
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/views/animation/ink_drop.h"
 #include "ui/views/animation/ink_drop_host.h"
 #include "ui/views/view.h"
 
 namespace views {
 class InkDropImpl;
+class InkDropMask;
 
 namespace test {
 class InkDropHostViewTestApi;
 }  // namespace test
 
 // A view that provides InkDropHost functionality.
 class VIEWS_EXPORT InkDropHostView : public View, public InkDropHost {
  public:
   // Used in SetInkDropMode() to specify whether the ink drop effect is enabled
   // or not for the view. In case of having an ink drop, it also specifies
@@ skipping 51 matching lines @@
   // Animates |ink_drop_| to the desired |ink_drop_state|. Caches |event| as the
   // last_ripple_triggering_event().
   //
   // *** NOTE ***: |event| has been plumbed through on a best effort basis for
   // the purposes of centering ink drop ripples on located Events.  Thus nullptr
   // has been used by clients who do not have an Event instance available to
   // them.
   void AnimateInkDrop(InkDropState state, const ui::LocatedEvent* event);
 
   // View:
+  void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
   void VisibilityChanged(View* starting_from, bool is_visible) override;
   void OnFocus() override;
   void OnBlur() override;
   void OnMouseEvent(ui::MouseEvent* event) override;
 
   // Overrideable methods to allow views to provide minor tweaks to the default
   // ink drop.
   virtual SkColor GetInkDropBaseColor() const;
 
+  // Subclasses can override to return a mask for the ink drop. By default,
+  // returns nullptr (i.e no mask).
+  virtual std::unique_ptr<views::InkDropMask> CreateInkDropMask() const;
+
   // Provides access to |ink_drop_|. Implements lazy initialization of
   // |ink_drop_| so as to avoid virtual method calls during construction since
   // subclasses should be able to call SetInkDropMode() during construction.
   InkDrop* GetInkDrop();
 
   // Returns an InkDropImpl configured to work well with a
   // flood-fill ink drop ripple.
   std::unique_ptr<InkDropImpl> CreateDefaultFloodFillInkDropImpl();
 
   // Returns an InkDropImpl with default configuration. The base implementation
@@ skipping 21 matching lines @@
   std::unique_ptr<InkDropGestureHandler> gesture_handler_;
 
   float ink_drop_visible_opacity_;
 
   // Determines whether the view was already painting to layer before adding ink
   // drop layer.
   bool old_paint_to_layer_;
 
   bool destroying_;
 
+  std::unique_ptr<views::InkDropMask> ink_drop_mask_;
+
   DISALLOW_COPY_AND_ASSIGN(InkDropHostView);
 };
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_INK_DROP_HOST_VIEW_H_