Android: move peerconnection out of power observer.

content/renderer/media/peer_connection_tracker.cc

Index: content/renderer/media/peer_connection_tracker.cc
diff --git a/content/renderer/media/peer_connection_tracker.cc b/content/renderer/media/peer_connection_tracker.cc
index c76674bde73cbdab54e5e00e6e53aa7016e5ab21..c15d8516ee8c37359b66c044e34c8b30ef8e1925 100644
--- a/content/renderer/media/peer_connection_tracker.cc
+++ b/content/renderer/media/peer_connection_tracker.cc
@@ -376,10 +376,15 @@ RenderThread* PeerConnectionTracker::SendTarget() {
 
 void PeerConnectionTracker::OnSuspend() {
   DCHECK(main_thread_.CalledOnValidThread());
+  // On Android 'Suspend' means more of the activity state. So it's better to
+  // keep the webrtc call session when user is doing something else or screen
+  // is off.
+#if !defined(OS_ANDROID)
   for (PeerConnectionIdMap::iterator it = peer_connection_id_map_.begin();
        it != peer_connection_id_map_.end(); ++it) {
     it->first->CloseClientPeerConnection();
   }
+#endif
 }
 
 void PeerConnectionTracker::OnStartEventLog(int peer_connection_id,