Fixing bug where Connection drops packets when presumed writable.

webrtc/p2p/base/transportchannel.h

Index: webrtc/p2p/base/transportchannel.h
diff --git a/webrtc/p2p/base/transportchannel.h b/webrtc/p2p/base/transportchannel.h
index 87ed9fdea310f99f9b23fcc4c4e354c2f12f60d2..411591c8496192391c1de80f1e013ddc0007416e 100644
--- a/webrtc/p2p/base/transportchannel.h
+++ b/webrtc/p2p/base/transportchannel.h
@@ -160,7 +160,9 @@ class TransportChannel : public sigslot::has_slots<> {
   // The first parameter is the transport channel that signals the event.
   // The second parameter is the new selected candidate pair. The third
   // parameter is the last packet id sent on the previous candidate pair.
-  sigslot::signal3<TransportChannel*, CandidatePairInterface*, int>
+  // The fourth parameter is a boolean which is true if the TransportChannel
+  // is ready to send with this candidate pair.
+  sigslot::signal4<TransportChannel*, CandidatePairInterface*, int, bool>
       SignalSelectedCandidatePairChanged;
 
   // Invoked when the channel is being destroyed.