mash: Migrate wallpaper controllers to ash/common.

ash/aura/wm_shell_aura.cc

 // Copyright 2016 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/aura/wm_shell_aura.h"
 
 #include <utility>
 
 #include "ash/aura/pointer_watcher_adapter.h"
 #include "ash/aura/wm_window_aura.h"
@@ skipping 257 matching lines @@
 }
 
 void WmShellAura::RemovePointerWatcher(views::PointerWatcher* watcher) {
   pointer_watcher_adapter_->RemovePointerWatcher(watcher);
 }
 
 bool WmShellAura::IsTouchDown() {
   return aura::Env::GetInstance()->is_touch_down();
 }
 
+base::SequencedWorkerPool* WmShellAura::GetBlockingPool() {
+  return Shell::GetInstance()->blocking_pool();
+}
+
 #if defined(OS_CHROMEOS)
 void WmShellAura::ToggleIgnoreExternalKeyboard() {
   Shell::GetInstance()
       ->virtual_keyboard_controller()
       ->ToggleIgnoreExternalKeyboard();
 }
 #endif
 
 void WmShellAura::OnWindowActivated(
     aura::client::ActivationChangeObserver::ActivationReason reason,
@@ skipping 19 matching lines @@
   FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
                     OnDisplayConfigurationChanging());
 }
 
 void WmShellAura::OnDisplayConfigurationChanged() {
   FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
                     OnDisplayConfigurationChanged());
 }
 
 }  // namespace ash