Fix gesture event handling in MenuButton

ui/views/win/hwnd_message_handler.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_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <windows.h>
 
 #include <set>
@@ skipping 567 matching lines @@
   // Indicates if the window needs the WS_VSCROLL and WS_HSCROLL styles.
   bool needs_scroll_styles_;
 
   // Set to true if we are in the context of a sizing operation.
   bool in_size_loop_;
 
   // Stores a pointer to the WindowEventTarget interface implemented by this
   // 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
   // synthesized mouse messages. For more information please refer to
   // the IsMouseEventFromTouch function.
   static long last_touch_message_time_;
 
   // Time the last WM_MOUSEHWHEEL message is received. Please refer to the
   // HandleMouseEventInternal function as to why this is needed.
   long last_mouse_hwheel_time_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_