ash: Add accelerator for snapping windows left/right.

ash/wm/window_util.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_util.h"
 
 #include "ash/shell.h"
 #include "ash/wm/activation_controller.h"
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_property.h"
 #include "ui/base/ui_base_types.h"
+#include "ui/gfx/monitor.h"
 #include "ui/gfx/screen.h"
 
 DECLARE_WINDOW_PROPERTY_TYPE(bool);
 
 namespace ash {
 DEFINE_WINDOW_PROPERTY_KEY(bool, kOpenWindowSplitKey, false);
 
 namespace wm {
 
 void ActivateWindow(aura::Window* window) {
@@ skipping 64 matching lines @@
 }
 
 void MinimizeWindow(aura::Window* window) {
   window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MINIMIZED);
 }
 
 void RestoreWindow(aura::Window* window) {
   window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_NORMAL);
 }
 
+void CenterWindow(aura::Window* window) {
+  const gfx::Monitor monitor = gfx::Screen::GetMonitorNearestWindow(window);
+  gfx::Rect center = monitor.work_area().Center(window->bounds().size());
+  window->SetBounds(center);
+}
+
 }  // namespace wm
 }  // namespace ash