[Views] Update ink drop for omnibox icons

ui/views/controls/button/custom_button.h

Index: ui/views/controls/button/custom_button.h
diff --git a/ui/views/controls/button/custom_button.h b/ui/views/controls/button/custom_button.h
index 44c2e1117971a2b85f7a0379c4ab34e953ac9c16..e4ce284350ee268bc76cccffb1960578cf19afe4 100644
--- a/ui/views/controls/button/custom_button.h
+++ b/ui/views/controls/button/custom_button.h
@@ -151,6 +151,10 @@ class VIEWS_EXPORT CustomButton : public Button, public gfx::AnimationDelegate {
   // This implementation returns true if the left mouse button is down.
   virtual bool IsTriggerableEvent(const ui::Event& event);
 
+  // Returns true if the ink drop should be updated by CustomButton when
+  // OnClickCanceled() is called. This method is provided for subclasses.
+  virtual bool ShouldUpdateInkDropOnClickCanceled() const;
+
   // Returns true if the button should become pressed when the user
   // holds the mouse down over the button. For this implementation,
   // we simply return IsTriggerableEvent(event).