Use PowerSaveBlocker for audio and video on Chrome OS.

content/public/browser/power_save_blocker.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 CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_
 #define CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 14 matching lines @@
     // Example use cases: downloading a file, playing audio.
     kPowerSaveBlockPreventAppSuspension,
 
     // Prevent the display from going to sleep. This also has the side effect of
     // preventing the system from sleeping, but does not necessarily prevent the
     // app from being suspended on some platforms if the user hides it.
     // Example use case: playing video.
     kPowerSaveBlockPreventDisplaySleep,
   };
 
+  // Reasons why power-saving features may be blocked.
+  enum Reason {
+    // Audio is being played.
+    kReasonAudioPlayback,
+    // Video is being played.
+    kReasonVideoPlayback,
+    // Power-saving is blocked for some other reason.
+    kReasonOther,
+  };
+
   virtual ~PowerSaveBlocker() = 0;
 
   // Pass in the type of power save blocking desired. If multiple types of
   // blocking are desired, instantiate one PowerSaveBlocker for each type.
-  // |reason| may be provided to the underlying system APIs on some platforms.
+  // |reason| and |description| (a more-verbose, human-readable justification of
+  // the blocking) may be provided to the underlying system APIs on some
+  // platforms.
   static scoped_ptr<PowerSaveBlocker> Create(PowerSaveBlockerType type,
-                                             const std::string& reason);
+                                             Reason reason,
+                                             const std::string& description);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_