Let ViEEncoder handle resolution changes.

webrtc/media/engine/fakewebrtccall.h

Index: webrtc/media/engine/fakewebrtccall.h
diff --git a/webrtc/media/engine/fakewebrtccall.h b/webrtc/media/engine/fakewebrtccall.h
index 170e6fce912d2eb1c102bd8b6b58d05c97b6c6d0..5719070eeaee78049889c62518b343163838b451 100644
--- a/webrtc/media/engine/fakewebrtccall.h
+++ b/webrtc/media/engine/fakewebrtccall.h
@@ -109,7 +109,7 @@ class FakeVideoSendStream final
   ~FakeVideoSendStream() override;
   const webrtc::VideoSendStream::Config& GetConfig() const;
   const webrtc::VideoEncoderConfig& GetEncoderConfig() const;
-  std::vector<webrtc::VideoStream> GetVideoStreams();
+  const std::vector<webrtc::VideoStream>& GetVideoStreams() const;
 
   bool IsSending() const;
   bool GetVp8Settings(webrtc::VideoCodecVP8* settings) const;
@@ -142,6 +142,7 @@ class FakeVideoSendStream final
   bool sending_;
   webrtc::VideoSendStream::Config config_;
   webrtc::VideoEncoderConfig encoder_config_;
+  std::vector<webrtc::VideoStream> video_streams_;
   bool codec_settings_set_;
   union VpxSettings {
     webrtc::VideoCodecVP8 vp8;