Fix behavior of WindowEventDispatcher::SynthesizeMouseMoveEvent().

ui/aura/window_event_dispatcher.h

 // Copyright 2014 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_AURA_WINDOW_EVENT_DISPATCHER_H_
 #define UI_AURA_WINDOW_EVENT_DISPATCHER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 198 matching lines @@
   // resizes when HoldMouseMoves() is called. The following methods are used to
   // dispatch held and newly incoming mouse and touch events, typically when an
   // event other than one of these needs dispatching or a matching
   // ReleaseMouseMoves()/ReleaseTouchMoves() is called.  NOTE: because these
   // methods dispatch events from WindowTreeHost the coordinates are in terms of
   // the root.
   ui::EventDispatchDetails DispatchHeldEvents() WARN_UNUSED_RESULT;
 
   // Posts a task to send synthesized mouse move event if there is no a pending
   // task.
-  void PostSynthesizeMouseMove();
+  void PostSynthesizeMouseMove(int mouse_button_flags);
 
   // Creates and dispatches synthesized mouse move event using the
   // current mouse location.
-  ui::EventDispatchDetails SynthesizeMouseMoveEvent() WARN_UNUSED_RESULT;
+  ui::EventDispatchDetails SynthesizeMouseMoveEvent(int mouse_button_flags)
+      WARN_UNUSED_RESULT;
 
   // Calls SynthesizeMouseMove() if |window| is currently visible and contains
   // the mouse cursor.
   void SynthesizeMouseMoveAfterChangeToWindow(Window* window);
 
   void PreDispatchLocatedEvent(Window* target, ui::LocatedEvent* event);
   void PreDispatchMouseEvent(Window* target, ui::MouseEvent* event);
   void PreDispatchTouchEvent(Window* target, ui::TouchEvent* event);
 
   WindowTreeHost* host_;
@@ skipping 27 matching lines @@
 
   // Used to schedule DispatchHeldEvents() when |move_hold_count_| goes to 0.
   base::WeakPtrFactory<WindowEventDispatcher> held_event_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowEventDispatcher);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_EVENT_DISPATCHER_H_