Fix gesture event handling in MenuButton

ui/views/win/hwnd_message_handler.h

Index: ui/views/win/hwnd_message_handler.h
diff --git a/ui/views/win/hwnd_message_handler.h b/ui/views/win/hwnd_message_handler.h
index bfa1710358d6c84fa2b065a702d3ce0b0c3a4185..24cd8fda66d53212e1cfbabe45a1a21ee0c17c0b 100644
--- a/ui/views/win/hwnd_message_handler.h
+++ b/ui/views/win/hwnd_message_handler.h
@@ -585,12 +585,12 @@ class VIEWS_EXPORT HWNDMessageHandler :
   // class. Allows callers to retrieve the interface pointer.
   scoped_ptr<ui::ViewProp> prop_window_target_;
 
-  // Set to true if we are in the context of a touch down event. This is reset
-  // to false in a delayed task. Defaults to false.
+  // Number of active touch down contexts. This is incremented on touch down
+  // events and decremented later using a delayed task.
   // We need this to ignore WM_MOUSEACTIVATE messages generated in response to
   // touch input. This is fine because activation still works correctly via
   // native SetFocus calls invoked in the views code.
-  bool touch_down_context_;
+  int touch_down_contexts_;
 
   // Time the last touch message was received. Used to flag mouse messages
   // synthesized by Windows for touch which are not flagged by the OS as