Add WebrtcVideoEncoder interface

remoting/codec/video_encoder_verbatim.h

Index: remoting/codec/video_encoder_verbatim.h
diff --git a/remoting/codec/video_encoder_verbatim.h b/remoting/codec/video_encoder_verbatim.h
index e4bf95a85b32a7642a71d0d458c57822a97c51e4..e4e070191e30b8417094bffca39bb5d7dfacddc4 100644
--- a/remoting/codec/video_encoder_verbatim.h
+++ b/remoting/codec/video_encoder_verbatim.h
@@ -19,8 +19,8 @@ class VideoEncoderVerbatim : public VideoEncoder {
   ~VideoEncoderVerbatim() override;
 
   // VideoEncoder interface.
-  std::unique_ptr<VideoPacket> Encode(const webrtc::DesktopFrame& frame,
-                                      uint32_t flags) override;
+  std::unique_ptr<VideoPacket> Encode(
+      const webrtc::DesktopFrame& frame) override;
 
  private:
   VideoEncoderHelper helper_;