cros: Suspend media sessions with display off trigger by tablet power button

ash/test/test_shell_delegate.h

 // 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.
 
 #ifndef ASH_TEST_TEST_SHELL_DELEGATE_H_
 #define ASH_TEST_TEST_SHELL_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 45 matching lines @@
   ui::MenuModel* CreateContextMenu(Shelf* shelf,
                                    const ShelfItem* item) override;
   GPUSupport* CreateGPUSupport() override;
   base::string16 GetProductName() const override;
   gfx::Image GetDeprecatedAcceleratorImage() const override;
   PrefService* GetActiveUserPrefService() const override;
   bool IsTouchscreenEnabledInPrefs(bool use_local_state) const override;
   void SetTouchscreenEnabledInPrefs(bool enabled,
                                     bool use_local_state) override;
   void UpdateTouchscreenStatusFromPrefs() override;
+  void SuspendMediaSessions() override;
 
   int num_exit_requests() const { return num_exit_requests_; }
 
   void SetForceMaximizeOnFirstRun(bool maximize) {
     force_maximize_on_first_run_ = maximize;
   }
 
+  bool media_sessions_suspended() const { return media_sessions_suspended_; }
+
  private:
-  int num_exit_requests_;
-  bool multi_profiles_enabled_;
-  bool force_maximize_on_first_run_;
-  bool touchscreen_enabled_in_local_pref_;
+  int num_exit_requests_ = 0;
+  bool multi_profiles_enabled_ = false;
+  bool force_maximize_on_first_run_ = false;
+  bool touchscreen_enabled_in_local_pref_ = true;
+  bool media_sessions_suspended_ = false;
   std::unique_ptr<ShelfInitializer> shelf_initializer_;
-  PrefService* active_user_pref_service_;  // Not owned.
+  PrefService* active_user_pref_service_ = nullptr;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(TestShellDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SHELL_DELEGATE_H_