Allow a LocatedEvent to be passed to MenuButton, so the ink drop animation is centered on the click…

ui/views/controls/button/menu_button.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_CONTROLS_BUTTON_MENU_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 14 matching lines @@
 //  A button that shows a menu when the left mouse button is pushed
 //
 ////////////////////////////////////////////////////////////////////////////////
 class VIEWS_EXPORT MenuButton : public LabelButton {
  public:
   // A scoped lock for keeping the MenuButton in STATE_PRESSED e.g., while a
   // menu is running. These are cumulative.
   class VIEWS_EXPORT PressedLock {
    public:
     explicit PressedLock(MenuButton* menu_button);
-    PressedLock(MenuButton* menu_button, bool is_sibling_menu_show);
+    // |event| is the event that caused the button to be pressed. May be null.
+    PressedLock(MenuButton* menu_button,
+                bool is_sibling_menu_show,
+                const ui::LocatedEvent* event);
     ~PressedLock();
 
    private:
     base::WeakPtr<MenuButton> menu_button_;
 
     DISALLOW_COPY_AND_ASSIGN(PressedLock);
   };
 
   static const char kViewClassName[];
 
@@ skipping 55 matching lines @@
 
   // Offset of the associated menu position.
   gfx::Point menu_offset_;
 
  private:
   friend class PressedLock;
 
   // Increment/decrement the number of "pressed" locks this button has, and
   // set the state accordingly. The ink drop is snapped to the final ACTIVATED
   // state if |snap_ink_drop_to_activated| is true, otherwise the ink drop will
-  // be animated to the ACTIVATED node_data.
-  void IncrementPressedLocked(bool snap_ink_drop_to_activated);
+  // be animated to the ACTIVATED node_data. The ink drop is animated at the
+  // location of |event| if non-null, otherwise at the default location.
+  void IncrementPressedLocked(bool snap_ink_drop_to_activated,
+                              const ui::LocatedEvent* event);
   void DecrementPressedLocked();
 
   // Compute the maximum X coordinate for the current screen. MenuButtons
   // use this to make sure a menu is never shown off screen.
   int GetMaximumScreenXCoordinate();
 
   // We use a time object in order to keep track of when the menu was closed.
   // The time is used for simulating menu behavior for the menu button; that
   // is, if the menu is shown and the button is pressed, we need to close the
   // menu. There is no clean way to get the second click event because the
@@ skipping 26 matching lines @@
   bool should_disable_after_press_;
 
   base::WeakPtrFactory<MenuButton> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_