mash: Migrate ScopedTargetRootWindow 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/scoped_root_window_for_new_windows_aura.h"
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shell_delegate.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard.h"
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/overview/window_selector_controller.h"
 #include "ash/common/wm_activation_observer.h"
 #include "ash/common/wm_display_observer.h"
 #include "ash/display/display_manager.h"
@@ skipping 65 matching lines @@
 WmWindow* WmShellAura::GetRootWindowForDisplayId(int64_t display_id) {
   return WmWindowAura::Get(Shell::GetInstance()
                                ->window_tree_host_manager()
                                ->GetRootWindowForDisplayId(display_id));
 }
 
 WmWindow* WmShellAura::GetRootWindowForNewWindows() {
   return WmWindowAura::Get(Shell::GetTargetRootWindow());
 }
 
+std::unique_ptr<ScopedRootWindowForNewWindows>
+WmShellAura::CreateScopedRootWindowForNewWindows(WmWindow* root) {
+  return base::MakeUnique<ScopedRootWindowForNewWindowsAura>(
+      WmWindowAura::GetAuraWindow(root));
+}
+
 const DisplayInfo& WmShellAura::GetDisplayInfo(int64_t display_id) const {
   return Shell::GetInstance()->display_manager()->GetDisplayInfo(display_id);
 }
 
 bool WmShellAura::IsActiveDisplayId(int64_t display_id) const {
   return Shell::GetInstance()->display_manager()->IsActiveDisplayId(display_id);
 }
 
 bool WmShellAura::IsForceMaximizeOnFirstRun() {
   return delegate()->IsForceMaximizeOnFirstRun();
@@ skipping 143 matching lines @@
   FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
                     OnDisplayConfigurationChanging());
 }
 
 void WmShellAura::OnDisplayConfigurationChanged() {
   FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
                     OnDisplayConfigurationChanged());
 }
 
 }  // namespace ash