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

webrtc/media/engine/webrtcvoiceengine.h

Index: webrtc/media/engine/webrtcvoiceengine.h
diff --git a/webrtc/media/engine/webrtcvoiceengine.h b/webrtc/media/engine/webrtcvoiceengine.h
index dbb7ea6e76715a811b75a9b907c0e7c4b077fef1..18c2c543652553264f1fbe61b82f64383ca128c5 100644
--- a/webrtc/media/engine/webrtcvoiceengine.h
+++ b/webrtc/media/engine/webrtcvoiceengine.h
@@ -31,7 +31,7 @@
 namespace cricket {
 
 class AudioDeviceModule;
-class AudioRenderer;
+class AudioSource;
 class VoEWrapper;
 class WebRtcVoiceMediaChannel;
 
@@ -161,7 +161,7 @@ class WebRtcVoiceMediaChannel final : public VoiceMediaChannel,
   bool SetAudioSend(uint32_t ssrc,
                     bool enable,
                     const AudioOptions* options,
-                    AudioRenderer* renderer) override;
+                    AudioSource* source) override;
   bool AddSendStream(const StreamParams& sp) override;
   bool RemoveSendStream(uint32_t ssrc) override;
   bool AddRecvStream(const StreamParams& sp) override;
@@ -215,7 +215,7 @@ class WebRtcVoiceMediaChannel final : public VoiceMediaChannel,
   bool SetOptions(const AudioOptions& options);
   bool SetMaxSendBandwidth(int bps);
   bool SetRecvCodecs(const std::vector<AudioCodec>& codecs);
-  bool SetLocalRenderer(uint32_t ssrc, AudioRenderer* renderer);
+  bool SetLocalSource(uint32_t ssrc, AudioSource* source);
   bool MuteStream(uint32_t ssrc, bool mute);
 
   WebRtcVoiceEngine* engine() { return engine_; }
@@ -225,8 +225,9 @@ class WebRtcVoiceMediaChannel final : public VoiceMediaChannel,
   void SetNack(int channel, bool nack_enabled);
   bool SetSendCodec(int channel, const webrtc::CodecInst& send_codec);
   bool ChangePlayout(bool playout);
-  bool ChangeSend(SendFlags send);
-  bool ChangeSend(int channel, SendFlags send);
+  // Update the send state for the channel associated with |ssrc|,
+  // according to |send| and whether or not the send stream is rendering.
+  bool UpdateChannelSendState(uint32_t ssrc, SendFlags send);
   int CreateVoEChannel();
   bool DeleteVoEChannel(int channel);
   bool IsDefaultRecvStream(uint32_t ssrc) {
@@ -249,7 +250,6 @@ class WebRtcVoiceMediaChannel final : public VoiceMediaChannel,
   bool nack_enabled_ = false;
   bool transport_cc_enabled_ = false;
   bool playout_ = false;
-  SendFlags desired_send_ = SEND_NOTHING;
   SendFlags send_ = SEND_NOTHING;
   webrtc::Call* const call_ = nullptr;