Impose PowerSaveBlock while remoting content via Cast or WebRTC.

content/browser/media/webrtc_internals.h

Index: content/browser/media/webrtc_internals.h
diff --git a/content/browser/media/webrtc_internals.h b/content/browser/media/webrtc_internals.h
index 6f22a999106e44dc1ccec7b0b2cb1d2972263188..1f30ce8f069b7b39a1edbd66ce7951880df3950f 100644
--- a/content/browser/media/webrtc_internals.h
+++ b/content/browser/media/webrtc_internals.h
@@ -6,6 +6,7 @@
 #define CONTENT_BROWSER_MEDIA_WEBRTC_INTERNALS_H_
 
 #include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
 #include "base/process/process.h"
@@ -16,6 +17,8 @@
 #include "ui/shell_dialogs/select_file_dialog.h"
 
 namespace content {
+
+class PowerSaveBlocker;
 class WebContents;
 class WebRTCInternalsUIObserver;
 
@@ -131,6 +134,11 @@ class CONTENT_EXPORT WebRTCInternals : public NotificationObserver,
   void EnableAecDumpOnAllRenderProcessHosts();
 #endif
 
+  // Called whenever an element is added to or removed from
+  // |peer_connection_data_| to impose/release a block on suspending the current
+  // application for power-saving.
+  void CreateOrReleasePowerSaveBlocker();
+
   ObserverList<WebRTCInternalsUIObserver> observers_;
 
   // |peer_connection_data_| is a list containing all the PeerConnection
@@ -166,6 +174,11 @@ class CONTENT_EXPORT WebRTCInternals : public NotificationObserver,
   // AEC dump (diagnostic echo canceller recording) state.
   bool aec_dump_enabled_;
   base::FilePath aec_dump_file_path_;
+
+  // While |peer_connection_data_| is non-empty, hold an instance of
+  // PowerSaveBlocker.  This prevents the application from being suspended while
+  // remoting.
+  scoped_ptr<PowerSaveBlocker> power_save_blocker_;
 };
 
 }  // namespace content