Add ink drop ripple to overview mode button

ash/common/system/tray/actionable_view.h

Index: ash/common/system/tray/actionable_view.h
diff --git a/ash/common/system/tray/actionable_view.h b/ash/common/system/tray/actionable_view.h
index 1dd60b4b41b68d3e63f6cf764c9ad286868baf64..bd074d39008f13b2957b34447731c39744f2b180 100644
--- a/ash/common/system/tray/actionable_view.h
+++ b/ash/common/system/tray/actionable_view.h
@@ -52,6 +52,13 @@ class ASH_EXPORT ActionableView : public views::ButtonListener,
   // been handled and an action was performed. Returns false otherwise.
   virtual bool PerformAction(const ui::Event& event) = 0;
 
+  // Called after PerformAction() to act upon its result, including showing
+  // appropriate ink drop ripple. By default shows triggered ripple if action is
+  // performed or hides existing ripple if no action is performed. Subclassed
+  // can override to change the default behavior.

[bruthig, 2016/11/11 17:30:40]

nit: Can you also note that this will not be called if this was destroyed.

[mohsen, 2016/11/11 22:37:24]

Done.

+  virtual void HandlePerformActionResult(bool action_performed,
+                                         const ui::Event& event);
+
   // Overridden from views::CustomButton.
   const char* GetClassName() const override;
   bool OnKeyPressed(const ui::KeyEvent& event) override;