Prevent a voice channel from sending data before a renderer is set.

webrtc/media/base/mediachannel.h

Index: webrtc/media/base/mediachannel.h
diff --git a/webrtc/media/base/mediachannel.h b/webrtc/media/base/mediachannel.h
index bab72b21926654ad0fb55c559787f717cdaf224c..2b064cd9f19a9899de371bcf8260485ac7a09f6c 100644
--- a/webrtc/media/base/mediachannel.h
+++ b/webrtc/media/base/mediachannel.h
@@ -42,7 +42,7 @@ class AudioSinkInterface;
 
 namespace cricket {
 
-class AudioRenderer;
+class AudioSource;
 class ScreencastId;
 class VideoCapturer;
 class VideoFrame;
@@ -448,11 +448,6 @@ class MediaChannel : public sigslot::has_slots<> {
   NetworkInterface* network_interface_;
 };
 
-enum SendFlags {
-  SEND_NOTHING,
-  SEND_MICROPHONE
-};
-
 // The stats information is structured as follows:
 // Media are represented by either MediaSenderInfo or MediaReceiverInfo.
 // Media contains a vector of SSRC infos that are exclusively used by this
@@ -901,12 +896,12 @@ class VoiceMediaChannel : public MediaChannel {
   // Starts or stops playout of received audio.
   virtual bool SetPlayout(bool playout) = 0;
   // Starts or stops sending (and potentially capture) of local audio.
-  virtual bool SetSend(SendFlags flag) = 0;
+  virtual bool SetSend(bool send) = 0;

[the sun, 2016/03/07 21:24:53]

Since WVoMC always returns true, change return type to void.

[Taylor Brandstetter, 2016/03/08 00:00:31]

Done.

   // Configure stream for sending.
   virtual bool SetAudioSend(uint32_t ssrc,
                             bool enable,
                             const AudioOptions* options,
-                            AudioRenderer* renderer) = 0;
+                            AudioSource* source) = 0;
   // Gets current energy levels for all incoming streams.
   virtual bool GetActiveStreams(AudioInfo::StreamList* actives) = 0;
   // Get the current energy level of the stream sent to the speaker.