Moves TransientWindowClient to ui/aura/client and adds observer

ash/test/ash_test_helper.h

 // Copyright 2013 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.
 
 #ifndef ASH_TEST_ASH_TEST_HELPER_H_
 #define ASH_TEST_ASH_TEST_HELPER_H_
 
 #include <memory>
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/test/material_design_controller_test_api.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 
 namespace aura {
 class Window;
 }  // namespace aura
 
 namespace ui {
 class ScopedAnimationDurationScaleMode;
 }  // namespace ui
 
 namespace views {
 class ViewsDelegate;
 }
 
+namespace wm {
+class WMState;
+}
+
 namespace ash {
 namespace test {
 
 class AshTestEnvironment;
 class TestScreenshotDelegate;
 class TestShellDelegate;
 class TestSessionStateDelegate;
 
 // A helper class that does common initialization required for Ash. Creates a
 // root window and an ash::Shell instance with a test delegate.
@@ skipping 36 matching lines @@
   static bool SupportsMultipleDisplays();
 
  private:
   AshTestEnvironment* ash_test_environment_;  // Not owned.
   TestShellDelegate* test_shell_delegate_;  // Owned by ash::Shell.
   std::unique_ptr<ui::ScopedAnimationDurationScaleMode> zero_duration_mode_;
 
   // Owned by ash::AcceleratorController
   TestScreenshotDelegate* test_screenshot_delegate_;
 
+  std::unique_ptr<::wm::WMState> wm_state_;
   std::unique_ptr<views::ViewsDelegate> views_delegate_;
 
 #if defined(OS_CHROMEOS)
   // Check if DBus Thread Manager was initialized here.
   bool dbus_thread_manager_initialized_;
   // Check if Bluez DBus Manager was initialized here.
   bool bluez_dbus_manager_initialized_;
 #endif
 
   std::unique_ptr<test::MaterialDesignControllerTestAPI> material_design_state_;
 
   DISALLOW_COPY_AND_ASSIGN(AshTestHelper);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_ASH_TEST_HELPER_H_