Deliver webrtc-internals updates in bulk, every 500ms at most.

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 63c55145e357fcb4736dfb76a358b211d638cd85..7828231269a500623214389ceefc9207545c00e0 100644
--- a/content/renderer/media/peer_connection_tracker.h
+++ b/content/renderer/media/peer_connection_tracker.h
@@ -163,16 +163,21 @@ class CONTENT_EXPORT PeerConnectionTracker
  private:
   // Assign a local ID to a peer connection so that the browser process can
   // uniquely identify a peer connection in the renderer process.
+  // The return value will always be positive.
   int GetNextLocalID();
 
+  // Looks up a handler in our map and if found, returns its ID.  If the handler
+  // is not registered, the return value will be -1.
+  int GetLocalIDForHandler(RTCPeerConnectionHandler* handler) const;
+
   // 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,
+  void SendPeerConnectionUpdate(int local_id,

[Henrik Grunell, 2016/02/08 09:52:08]

Nit: Would be great to add a comment for this function while at it. For example,
what is |callback_type|?

[tommi (sloooow) - chröme, 2016/02/08 13:50:23]

Done.

[Henrik Grunell, 2016/02/09 08:18:11]

Great comment. Thanks!

+                                const char* callback_type,
                                 const std::string& value);
 
   // This map stores the local ID assigned to each RTCPeerConnectionHandler.