Introdcue AshWindowTreeHost and move ash/chrome specific code in WTH to ash.

ash/accelerators/accelerator_controller.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/accelerators/accelerator_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <iostream>
 #include <string>
 
 #include "ash/accelerators/accelerator_commands.h"
 #include "ash/accelerators/accelerator_table.h"
 #include "ash/accelerators/debug_commands.h"
 #include "ash/ash_switches.h"
 #include "ash/debug.h"
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/focus_cycler.h"
 #include "ash/gpu_support.h"
 #include "ash/ime_control_delegate.h"
+#include "ash/host/ash_window_tree_host.h"
 #include "ash/magnifier/magnification_controller.h"
 #include "ash/magnifier/partial_magnification_controller.h"
 #include "ash/media_delegate.h"
 #include "ash/multi_profile_uma.h"
 #include "ash/new_window_delegate.h"
 #include "ash/root_window_controller.h"
 #include "ash/rotator/screen_rotation.h"
 #include "ash/screenshot_delegate.h"
 #include "ash/session_state_delegate.h"
 #include "ash/shelf/shelf.h"
@@ skipping 459 matching lines @@
 
 bool HandleToggleFullscreen(ui::KeyboardCode key_code) {
   if (key_code == ui::VKEY_MEDIA_LAUNCH_APP2) {
     base::RecordAction(UserMetricsAction("Accel_Fullscreen_F4"));
   }
   accelerators::ToggleFullscreen();
   return true;
 }
 
 bool HandleToggleRootWindowFullScreen() {
-  Shell::GetPrimaryRootWindow()->GetHost()->ToggleFullScreen();
+  Shell::GetPrimaryRootWindowController()->ash_host()->ToggleFullScreen();
   return true;
 }
 
 bool HandleWindowSnap(int action) {
   wm::WindowState* window_state = wm::GetActiveWindowState();
   // Disable window snapping shortcut key for full screen window due to
   // http://crbug.com/135487.
   if (!window_state ||
       window_state->window()->type() != ui::wm::WINDOW_TYPE_NORMAL ||
       window_state->IsFullscreen()) {
@@ skipping 677 matching lines @@
     keyboard_brightness_control_delegate) {
   keyboard_brightness_control_delegate_ =
       keyboard_brightness_control_delegate.Pass();
 }
 
 bool AcceleratorController::CanHandleAccelerators() const {
   return true;
 }
 
 }  // namespace ash