Use PowerSaveBlocker for audio and video on Chrome OS.

chrome/browser/apps/ephemeral_app_browsertest.cc

 // Copyright 2014 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 "chrome/browser/apps/ephemeral_app_browsertest.h"
 
 #include <vector>
 
 #include "apps/app_restore_service.h"
 #include "apps/saved_files_service.h"
@@ skipping 142 matching lines @@
  public:
   explicit PowerSaveBlockerStub(PowerSettingsMock* power_settings)
       : power_settings_(power_settings) {
     power_settings_->request_keep_awake();
   }
 
   ~PowerSaveBlockerStub() override { power_settings_->release_keep_awake(); }
 
   static scoped_ptr<PowerSaveBlocker> Create(PowerSettingsMock* power_settings,
                                              PowerSaveBlockerType type,
-                                             const std::string& reason) {
+                                             Reason reason,
+                                             const std::string& description) {
     return scoped_ptr<PowerSaveBlocker>(
         new PowerSaveBlockerStub(power_settings));
   }
 
  private:
   PowerSettingsMock* power_settings_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(PowerSaveBlockerStub);
 };
 
@@ skipping 859 matching lines @@
       base::Bind(&PowerSaveBlockerStub::Create, &power_settings));
 
   const Extension* app = InstallAndLaunchEphemeralApp(kPowerTestApp);
   ASSERT_TRUE(app);
   EXPECT_EQ(1, power_settings.keep_awake_count());
 
   CloseAppWaitForUnload(app->id());
 
   EXPECT_EQ(0, power_settings.keep_awake_count());
 }