Add MD ink drop ripple to shelf app items

ash/shelf/overflow_button.h

Index: ash/shelf/overflow_button.h
diff --git a/ash/shelf/overflow_button.h b/ash/shelf/overflow_button.h
index 205f3a55384168717e84c9d44d8ad48e949b5fc2..75cb445d5152cb34296fc3d54965612687398f7d 100644
--- a/ash/shelf/overflow_button.h
+++ b/ash/shelf/overflow_button.h
@@ -13,12 +13,12 @@
 
 namespace ash {
 
-class Shelf;
+class ShelfView;
 
 // Shelf overflow chevron button.
 class OverflowButton : public views::CustomButton {
  public:
-  OverflowButton(views::ButtonListener* listener, Shelf* shelf);
+  explicit OverflowButton(ShelfView* shelf_view);
   ~OverflowButton() override;
 
   void OnShelfAlignmentChanged();
@@ -27,6 +27,9 @@ class OverflowButton : public views::CustomButton {
   // views::View:
   void OnPaint(gfx::Canvas* canvas) override;
 
+  // views::CustomButton:
+  void NotifyClick(const ui::Event& event) override;
+
   // Helper functions to paint the background and foreground of the button
   // at |bounds|.
   void PaintBackground(gfx::Canvas* canvas, const gfx::Rect& bounds);
@@ -49,7 +52,7 @@ class OverflowButton : public views::CustomButton {
   gfx::ImageSkia right_image_;
   // Bottom image is owned by the resource bundle.
   const gfx::ImageSkia* bottom_image_;
-  Shelf* shelf_;
+  ShelfView* shelf_view_;

[James Cook, 2016/06/13 19:55:35]

Aside: This is fine for this CL, but in the medium-term I would like to reduce
the amount of interdependency between the various Shelf* classes. Specifically,
I'd like to move to WmShelf being the main "shelf controller" class that
everyone depends on.

[mohsen, 2016/06/14 06:24:38]

I guess this should have been addressed by introduction of InkDropButtonListener
interface.

 
   DISALLOW_COPY_AND_ASSIGN(OverflowButton);
 };