MockDataChannelImpl: Implement new interface methods as NOTIMPLEMENTED()

content/renderer/media/mock_data_channel_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_MOCK_DATA_CHANNEL_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_MOCK_DATA_CHANNEL_IMPL_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 12 matching lines @@
   void UnregisterObserver() override;
   std::string label() const override;
   bool reliable() const override;
   bool ordered() const override;
   uint16_t maxRetransmitTime() const override;
   uint16_t maxRetransmits() const override;
   std::string protocol() const override;
   bool negotiated() const override;
   int id() const override;
   DataState state() const override;
+  uint32_t messages_sent() const override;
+  uint64_t bytes_sent() const override;
+  uint32_t messages_received() const override;
+  uint64_t bytes_received() const override;
   uint64_t buffered_amount() const override;
   void Close() override;
   bool Send(const webrtc::DataBuffer& buffer) override;
 
   // For testing.
   void changeState(DataState state);
 
  protected:
   ~MockDataChannel() override;
 
  private:
   std::string label_;
   bool reliable_;
   webrtc::DataChannelInterface::DataState state_;
   webrtc::DataChannelInit config_;
   webrtc::DataChannelObserver* observer_;
 
   DISALLOW_COPY_AND_ASSIGN(MockDataChannel);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MOCK_DATA_CHANNEL_IMPL_H_