Align new VoE API with design.

webrtc/audio_send_stream.h

Index: webrtc/audio_send_stream.h
diff --git a/webrtc/audio_send_stream.h b/webrtc/audio_send_stream.h
index 695d28f21e02ddfed09391a4019266d4b861a4a6..457aa5cb0df27a26bce9c5dd80ea7907665baf87 100644
--- a/webrtc/audio_send_stream.h
+++ b/webrtc/audio_send_stream.h
@@ -48,6 +48,11 @@ class AudioSendStream : public SendStream {
     // Transport for outgoing packets.
     Transport* send_transport = nullptr;
 
+    // Underlying VoiceEngine handle, used to map AudioSendStream to lower-level
+    // components. Temporarily used while VoiceEngine channels are created
+    // outside of Call.

[kwiberg-webrtc, 2015/09/30 12:04:30]

It might not be immediately clear if "temporarily" means this is used only for
brief periods, or if it's a temporary construct. Maybe

  // Underlying VoiceEngine handle, used to map AudioSendStream
  // to lower-level components.
  // TODO(🌄1): Remove when VoiceEngine channels are no longer
  // created outside of Call.

+    int voe_channel_id = -1;
+
     rtc::scoped_ptr<AudioEncoder> encoder;
     int cng_payload_type = -1;  // pt, or -1 to disable Comfort Noise Generator.
     int red_payload_type = -1;  // pt, or -1 to disable REDundant coding.