Snap widgets to pixel boundary on ash

ash/wm/window_properties.cc

 // 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.
 
 #include "ash/wm/window_properties.h"
 
 #include "ash/wm/window_state.h"
 #include "ui/aura/window_property.h"
 
 DECLARE_WINDOW_PROPERTY_TYPE(ash::wm::WindowState*);
 DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(ASH_EXPORT, gfx::Rect*)
 DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(ASH_EXPORT, ui::WindowShowState)
 
 namespace ash {
 
 DEFINE_OWNED_WINDOW_PROPERTY_KEY(gfx::Rect,
                                  kRestoreBoundsOverrideKey,
                                  NULL);
 
 DEFINE_WINDOW_PROPERTY_KEY(ui::WindowShowState,
                            kRestoreShowStateOverrideKey,
                            ui::SHOW_STATE_DEFAULT);
 
+DEFINE_WINDOW_PROPERTY_KEY(bool, kSnapChildrenToPixelBoundary, false);
+
 DEFINE_WINDOW_PROPERTY_KEY(bool, kStayInSameRootWindowKey, false);
+
 DEFINE_WINDOW_PROPERTY_KEY(bool, kUsesScreenCoordinatesKey, false);
+
 DEFINE_OWNED_WINDOW_PROPERTY_KEY(wm::WindowState,
                                  kWindowStateKey, NULL);
 
 }  // namespace ash