Add MD ink drop ripple to shelf app items

ui/views/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 UI_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 305 matching lines @@
 
   // Sets the transform to the supplied transform.
   void SetTransform(const gfx::Transform& transform);
 
   // Sets whether this view paints to a layer. A view paints to a layer if
   // either of the following are true:
   // . the view has a non-identity transform.
   // . SetPaintToLayer(true) has been invoked.
   // View creates the Layer only when it exists in a Widget with a non-NULL
   // Compositor.
+  // TODO(mohsen): Consider making this robust against multiple places changing
+  // it at the same time. For example, class A might set this to true, then
+  // class B sets it to true. Then if class A sets it to false, the layer would
+  // be destroyed and class B might run into problems assuming it is still
+  // painting to layer.

[sadrul, 2016/06/16 15:56:27]

We should not do this here. Normally, there would be just one place where this
decision is made for a View. This extra checks should live in the places where
something else also needs to affect this decision.

[mohsen, 2016/06/16 16:28:47]

OK. Removed.

   void SetPaintToLayer(bool paint_to_layer);
 
   // Overridden from ui::LayerOwner:
   std::unique_ptr<ui::Layer> RecreateLayer() override;
 
   // RTL positioning -----------------------------------------------------------
 
   // Methods for accessing the bounds and position of the view, relative to its
   // parent. The position returned is mirrored if the parent view is using a RTL
   // layout.
@@ skipping 1233 matching lines @@
   // Belongs to this view, but it's reference-counted on some platforms
   // so we can't use a scoped_ptr. It's dereferenced in the destructor.
   NativeViewAccessibility* native_view_accessibility_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_