Changes MouseEvent constructor to take changed_button_flags.

ui/events/event.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_EVENTS_EVENT_H_
 #define UI_EVENTS_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
@@ skipping 303 matching lines @@
       : LocatedEvent(model, source, target),
         changed_button_flags_(model.changed_button_flags_) {
     SetType(type);
     set_flags(flags);
   }
 
   // Used for synthetic events in testing and by the gesture recognizer.
   MouseEvent(EventType type,
              const gfx::Point& location,
              const gfx::Point& root_location,
-             int flags);
+             int flags,
+             int changed_button_flags);
 
   // Conveniences to quickly test what button is down
   bool IsOnlyLeftMouseButton() const {
     return (flags() & EF_LEFT_MOUSE_BUTTON) &&
       !(flags() & (EF_MIDDLE_MOUSE_BUTTON | EF_RIGHT_MOUSE_BUTTON));
   }
 
   bool IsLeftMouseButton() const {
     return (flags() & EF_LEFT_MOUSE_BUTTON) != 0;
   }
@@ skipping 330 matching lines @@
   // The set of indices of ones in the binary representation of
   // touch_ids_bitfield_ is the set of touch_ids associate with this gesture.
   // This value is stored as a bitfield because the number of touch ids varies,
   // but we currently don't need more than 32 touches at a time.
   const unsigned int touch_ids_bitfield_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_H_