Don't reconfigure the encoder if the video options aren't changing.

webrtc/media/engine/fakewebrtccall.h

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 99 matching lines @@
 
   bool IsSending() const;
   bool GetVp8Settings(webrtc::VideoCodecVP8* settings) const;
   bool GetVp9Settings(webrtc::VideoCodecVP9* settings) const;
 
   int GetNumberOfSwappedFrames() const;
   int GetLastWidth() const;
   int GetLastHeight() const;
   int64_t GetLastTimestamp() const;
   void SetStats(const webrtc::VideoSendStream::Stats& stats);
+  int num_encoder_reconfigurations() const {
+    return num_encoder_reconfigurations_;
+  }
 
  private:
   void IncomingCapturedFrame(const webrtc::VideoFrame& frame) override;
 
   // webrtc::SendStream implementation.
   void Start() override;
   void Stop() override;
   void SignalNetworkState(webrtc::NetworkState state) override {}
   bool DeliverRtcp(const uint8_t* packet, size_t length) override {
     return true;
   }
 
   // webrtc::VideoSendStream implementation.
   webrtc::VideoSendStream::Stats GetStats() override;
   bool ReconfigureVideoEncoder(
       const webrtc::VideoEncoderConfig& config) override;
   webrtc::VideoCaptureInput* Input() override;
 
   bool sending_;
   webrtc::VideoSendStream::Config config_;
   webrtc::VideoEncoderConfig encoder_config_;
   bool codec_settings_set_;
   union VpxSettings {
     webrtc::VideoCodecVP8 vp8;
     webrtc::VideoCodecVP9 vp9;
   } vpx_settings_;
   int num_swapped_frames_;
   webrtc::VideoFrame last_frame_;
   webrtc::VideoSendStream::Stats stats_;
+  int num_encoder_reconfigurations_ = 0;
 };
 
 class FakeVideoReceiveStream final : public webrtc::VideoReceiveStream {
  public:
   explicit FakeVideoReceiveStream(
       const webrtc::VideoReceiveStream::Config& config);
 
   webrtc::VideoReceiveStream::Config GetConfig();
 
   bool IsReceiving() const;
@@ skipping 85 matching lines @@
   std::vector<FakeAudioSendStream*> audio_send_streams_;
   std::vector<FakeVideoReceiveStream*> video_receive_streams_;
   std::vector<FakeAudioReceiveStream*> audio_receive_streams_;
 
   int num_created_send_streams_;
   int num_created_receive_streams_;
 };
 
 }  // namespace cricket
 #endif  // TALK_MEDIA_WEBRTC_WEBRTCVIDEOENGINE2_UNITTEST_H_