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

ash/test/test_shell_delegate.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/test/test_shell_delegate.h"
 
 #include <limits>
 
 #include "ash/gpu_support_stub.h"
 #include "ash/palette_delegate.h"
@@ skipping 36 matching lines @@
       shelf->SetAlignment(SHELF_ALIGNMENT_BOTTOM);
       shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_NEVER);
       shelf->UpdateVisibilityState();
     }
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShelfInitializer);
 };
 
-TestShellDelegate::TestShellDelegate()
-    : num_exit_requests_(0),
-      multi_profiles_enabled_(false),
-      force_maximize_on_first_run_(false),
-      touchscreen_enabled_in_local_pref_(true),
-      active_user_pref_service_(nullptr) {}
+TestShellDelegate::TestShellDelegate() = default;
 
-TestShellDelegate::~TestShellDelegate() {}
+TestShellDelegate::~TestShellDelegate() = default;
 
 ::service_manager::Connector* TestShellDelegate::GetShellConnector() const {
   return nullptr;
 }
 
 bool TestShellDelegate::IsIncognitoAllowed() const {
   return true;
 }
 
 bool TestShellDelegate::IsMultiProfilesEnabled() const {
@@ skipping 83 matching lines @@
 }
 
 void TestShellDelegate::SetTouchscreenEnabledInPrefs(bool enabled,
                                                      bool use_local_state) {
   if (use_local_state)
     touchscreen_enabled_in_local_pref_ = enabled;
 }
 
 void TestShellDelegate::UpdateTouchscreenStatusFromPrefs() {}
 
+void TestShellDelegate::SuspendMediaSessions() {
+  media_sessions_suspended_ = true;
+}
+
 }  // namespace test
 }  // namespace ash