Support for onbufferedamountlow

talk/app/webrtc/test/mockpeerconnectionobservers.h

Index: talk/app/webrtc/test/mockpeerconnectionobservers.h
diff --git a/talk/app/webrtc/test/mockpeerconnectionobservers.h b/talk/app/webrtc/test/mockpeerconnectionobservers.h
index 580a0fbb85bfd25b257d01c5e9a8bb16a9ace63c..d2697b4364efcaa62e68f96609703cac30b66cf1 100644
--- a/talk/app/webrtc/test/mockpeerconnectionobservers.h
+++ b/talk/app/webrtc/test/mockpeerconnectionobservers.h
@@ -98,8 +98,10 @@ class MockDataChannelObserver : public webrtc::DataChannelObserver {
     channel_->UnregisterObserver();
   }
 
-  virtual void OnStateChange() { state_ = channel_->state(); }
-  virtual void OnMessage(const DataBuffer& buffer) {
+  void OnBufferedAmountChange(uint64 previous_amount) override {}
+
+  void OnStateChange() override { state_ = channel_->state(); }
+  void OnMessage(const DataBuffer& buffer) override {
     last_message_.assign(buffer.data.data<char>(), buffer.data.size());
     ++received_message_count_;
   }