Implement timing frames.

webrtc/modules/video_coding/codecs/vp8/vp8_impl.h

Index: webrtc/modules/video_coding/codecs/vp8/vp8_impl.h
diff --git a/webrtc/modules/video_coding/codecs/vp8/vp8_impl.h b/webrtc/modules/video_coding/codecs/vp8/vp8_impl.h
index 376dde1280819bb8fee321754bfd3fbf2a6a59ba..82cf04e5b1fbe3ffa68f56df86df684e0f640490 100644
--- a/webrtc/modules/video_coding/codecs/vp8/vp8_impl.h
+++ b/webrtc/modules/video_coding/codecs/vp8/vp8_impl.h
@@ -86,7 +86,8 @@ class VP8EncoderImpl : public VP8Encoder {
                              uint32_t timestamp);
 
   int GetEncodedPartitions(const TemporalLayers::FrameConfig tl_configs[],
-                           const VideoFrame& input_image);
+                           const VideoFrame& input_image,
+                           int64_t encode_start_ms);
 
   // Set the stream state for stream |stream_idx|.
   void SetStreamState(bool send_stream, int stream_idx);
@@ -114,6 +115,7 @@ class VP8EncoderImpl : public VP8Encoder {
   std::vector<vpx_codec_ctx_t> encoders_;
   std::vector<vpx_codec_enc_cfg_t> configurations_;
   std::vector<vpx_rational_t> downsampling_factors_;
+  int64_t last_timing_frame_time_ms_;
 };
 
 class VP8DecoderImpl : public VP8Decoder {