Reland r290125: Close all active PeerConnections upon OS suspend

content/renderer/media/peer_connection_tracker.h

Index: content/renderer/media/peer_connection_tracker.h
diff --git a/content/renderer/media/peer_connection_tracker.h b/content/renderer/media/peer_connection_tracker.h
index 76607d71ff8910e56c54c7f55e37d4588a795cd0..9d5129da3788aa598acc112b98317117a86f76c5 100644
--- a/content/renderer/media/peer_connection_tracker.h
+++ b/content/renderer/media/peer_connection_tracker.h
@@ -161,6 +161,9 @@ class CONTENT_EXPORT PeerConnectionTracker : public RenderProcessObserver {
   // IPC Message handler for getting all stats.
   void OnGetAllStats();
 
+  // Called when the browser process reports a suspend event from the OS.
+  void OnSuspend();
+
   void SendPeerConnectionUpdate(RTCPeerConnectionHandler* pc_handler,
                                 const std::string& callback_type,
                                 const std::string& value);