Reset the BWE when the network changes

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 b91af139b7155d35589305deef52cb0bb7308eb5..26dd8aaca74921f3e2db6600ee7335be00c6a716 100644
--- a/webrtc/p2p/base/transportchannel.h
+++ b/webrtc/p2p/base/transportchannel.h
@@ -15,6 +15,7 @@
 #include <vector>
 
 #include "webrtc/p2p/base/candidate.h"
+#include "webrtc/p2p/base/port.h"
 #include "webrtc/p2p/base/transport.h"
 #include "webrtc/p2p/base/transportdescription.h"
 #include "webrtc/base/asyncpacketsocket.h"
@@ -146,11 +147,17 @@ class TransportChannel : public sigslot::has_slots<> {
   // Signalled each time a packet is sent on this channel.
   sigslot::signal2<TransportChannel*, const rtc::SentPacket&> SignalSentPacket;
 
+  // Deprecated by SignalBestConnectionChanged
   // This signal occurs when there is a change in the way that packets are
   // being routed, i.e. to a different remote location. The candidate
   // indicates where and how we are currently sending media.
   sigslot::signal2<TransportChannel*, const Candidate&> SignalRouteChange;
 
+  // This signals the network has changed on either end of the connection.
+  // The first parameter is the transport channel that signaled the event.
+  // The second parameter is the selected candidate pair (or connection).
+  sigslot::signal2<TransportChannel*, Connection*> SignalBestConnectionChanged;
+
   // Invoked when the channel is being destroyed.
   sigslot::signal1<TransportChannel*> SignalDestroyed;