Add ink drop ripple to shelf overflow button

ash/test/shelf_view_test_api.h

Index: ash/test/shelf_view_test_api.h
diff --git a/ash/test/shelf_view_test_api.h b/ash/test/shelf_view_test_api.h
index 445088bbe2cd1edf53f98517204fe1d47d616bc3..44110fdedae2b42c1e8ca7e1805681b1840d0158 100644
--- a/ash/test/shelf_view_test_api.h
+++ b/ash/test/shelf_view_test_api.h
@@ -25,6 +25,7 @@ class InkDrop;
 
 namespace ash {
 class OverflowBubble;
+class OverflowButton;
 class ShelfButton;
 class ShelfButtonPressedMetricTracker;
 class ShelfDelegate;
@@ -61,6 +62,9 @@ class ShelfViewTestAPI {
   // Makes shelf view show its overflow bubble.
   void ShowOverflowBubble();
 
+  // Makes shelf view hide its overflow bubble.
+  void HideOverflowBubble();
+
   // Sets animation duration in milliseconds for test.
   void SetAnimationDuration(int duration_ms);
 
@@ -79,6 +83,9 @@ class ShelfViewTestAPI {
   // An accessor for overflow bubble.
   OverflowBubble* overflow_bubble();
 
+  // An accessor for overflow button.
+  OverflowButton* overflow_button() const;
+
   // Returns the preferred size of |shelf_view_|.
   gfx::Size GetPreferredSize();