Add WebrtcVideoEncoder interface

remoting/codec/video_encoder.h

Index: remoting/codec/video_encoder.h
diff --git a/remoting/codec/video_encoder.h b/remoting/codec/video_encoder.h
index 3cd24837fbc6140cd4b11109c9b01bcc6f89fe79..61318e33e3ca3a2084da00d9a69c22961d4d6ed2 100644
--- a/remoting/codec/video_encoder.h
+++ b/remoting/codec/video_encoder.h
@@ -23,7 +23,6 @@ class VideoPacket;
 // interface is asynchronous to enable maximum throughput.
 class VideoEncoder {
  public:
-  enum Flags { REQUEST_KEY_FRAME = 1 << 0 };
   virtual ~VideoEncoder() {}
 
   // Request that the encoder provide lossless encoding, or color, if possible.
@@ -34,12 +33,11 @@ class VideoEncoder {
   // then the encoder may return a packet (e.g. to top-off previously-encoded
   // portions of the frame to higher quality) or return nullptr to indicate that
   // there is no work to do.
-  virtual std::unique_ptr<VideoPacket> Encode(const webrtc::DesktopFrame& frame,
-                                              uint32_t flags) = 0;
+  virtual std::unique_ptr<VideoPacket> Encode(
+      const webrtc::DesktopFrame& frame) = 0;
 
   static std::unique_ptr<VideoEncoder> Create(
       const protocol::SessionConfig& config);
-  virtual void UpdateTargetBitrate(int bitrate_kbps) {}
 };
 
 }  // namespace remoting