Ensure that mouse lock works correctly on Chrome ASH in Windows 8.

ui/aura/remote_window_tree_host_win.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_AURA_REMOTE_WINDOW_TREE_HOST_WIN_H_
 #define UI_AURA_REMOTE_WINDOW_TREE_HOST_WIN_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 153 matching lines @@
 
   uint32 key_event_flags() const {
     return event_flags_ & (ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN |
                            ui::EF_ALT_DOWN | ui::EF_CAPS_LOCK_DOWN);
   }
 
   HWND remote_window_;
   IPC::Sender* host_;
   scoped_ptr<ui::ViewProp> prop_;
 
-  // Set to true if we need to ignore mouse messages until the SetCursorPos
+  // Incremented if we need to ignore mouse messages until the SetCursorPos
   // operation is acked by the viewer.
-  bool ignore_mouse_moves_until_set_cursor_ack_;
+  int ignore_mouse_moves_until_set_cursor_ack_;
 
   // Tracking last click event for synthetically generated mouse events.
   scoped_ptr<ui::MouseEvent> last_mouse_click_event_;
 
   // State of the keyboard/mouse at the time of the last input event. See
   // description of SetEventFlags().
   uint32 event_flags_;
 
   // Current size of this root window.
   gfx::Size window_size_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteWindowTreeHostWin);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_REMOTE_WINDOW_TREE_HOST_WIN_H_