Initialize VideoEncoder objects asynchronously.

webrtc/video/vie_channel.h

Index: webrtc/video/vie_channel.h
diff --git a/webrtc/video/vie_channel.h b/webrtc/video/vie_channel.h
index 4ba394817f256a1622c5ca9a354973a2f6db135c..144e531ed699428fee1be32bda097b814d365e6c 100644
--- a/webrtc/video/vie_channel.h
+++ b/webrtc/video/vie_channel.h
@@ -56,7 +56,8 @@ enum StreamType {
   kViEStreamTypeRtx = 1      // Retransmission media stream
 };
 
-class ViEChannel : public VCMFrameTypeCallback,
+class ViEChannel : public Module,
+                   public VCMFrameTypeCallback,
                    public VCMReceiveCallback,
                    public VCMReceiveStatisticsCallback,
                    public VCMDecoderTimingCallback,
@@ -82,9 +83,13 @@ class ViEChannel : public VCMFrameTypeCallback,
 
   int32_t Init();
 
-  // Sets the encoder to use for the channel. |new_stream| indicates the encoder
-  // type has changed and we should start a new RTP stream.
-  int32_t SetSendCodec(const VideoCodec& video_codec, bool new_stream = true);
+  // Runs all RTP modules. Done since all modules have to be registered on the
+  // main thread, but we allocate/deallocate on the encoding thread.
+  int64_t TimeUntilNextProcess() override;
+  int32_t Process() override;
+
+  // Sets the encoder to use for the channel.
+  void SetSendCodec(const VideoCodec& video_codec);
   int32_t SetReceiveCodec(const VideoCodec& video_codec);
   // Registers an external decoder.
   void RegisterExternalDecoder(const uint8_t pl_type, VideoDecoder* decoder);