Reset the BWE when the network changes

webrtc/base/network.h

Index: webrtc/base/network.h
diff --git a/webrtc/base/network.h b/webrtc/base/network.h
index 680c005ea29ace284f9aae3c7bf4c07f9694f6a0..b788332d4d303ee4642cb90558b381a396254cb3 100644
--- a/webrtc/base/network.h
+++ b/webrtc/base/network.h
@@ -339,6 +339,9 @@ class Network {
   AdapterType type() const { return type_; }
   void set_type(AdapterType type) { type_ = type; }
 
+  // Converts the key to an integer id.
+  int id() const { return static_cast<int>(std::hash<std::string>()(key_)); }

[pthatcher1, 2016/03/16 21:22:02]

We should probably make this a uint16_t or uint32_t to make it clear what the
range is.  We can't have this thing return a value outside the range that the
STUN attribute could support. I think I'd prefer uint16_t so we could have it
fit into the same STUN attribute as network-cost.

[honghaiz3, 2016/03/17 03:38:26]

Done.

+
   int preference() const { return preference_; }
   void set_preference(int preference) { preference_ = preference; }