Build WebRTC with data channel only.

webrtc/pc/peerconnectionfactory.h

Index: webrtc/pc/peerconnectionfactory.h
diff --git a/webrtc/pc/peerconnectionfactory.h b/webrtc/pc/peerconnectionfactory.h
index 0bf05bd714dcee95430b89f85d08cb2487e04f2e..938cda29c6a2ed33d8d42d4921edb8ecf40a5916 100644
--- a/webrtc/pc/peerconnectionfactory.h
+++ b/webrtc/pc/peerconnectionfactory.h
@@ -105,9 +105,14 @@ class PeerConnectionFactory : public PeerConnectionFactoryInterface {
   const Options& options() const { return options_; }
 
  protected:
+  // Deprecated. Use the method with media_engine, call_factory_, and
+  // event_log_factory instead.

[Taylor Brandstetter, 2017/06/14 01:54:16]

Same as other comment: is there anything preventing us from getting rid of the
other constructors in this CL?

[Zhi Huang, 2017/06/14 06:57:01]

If no other applications call this method directly, then we can remove it. I'll
try to remove it to see what happens internally.

   PeerConnectionFactory(
       rtc::scoped_refptr<webrtc::AudioEncoderFactory> audio_encoder_factory,
       rtc::scoped_refptr<webrtc::AudioDecoderFactory> audio_decoder_factory);
+
+  // Deprecated. Use the method with media_engine, call_factory_, and
+  // event_log_factory instead.
   PeerConnectionFactory(
       rtc::Thread* network_thread,
       rtc::Thread* worker_thread,
@@ -118,10 +123,24 @@ class PeerConnectionFactory : public PeerConnectionFactoryInterface {
       cricket::WebRtcVideoEncoderFactory* video_encoder_factory,
       cricket::WebRtcVideoDecoderFactory* video_decoder_factory,
       rtc::scoped_refptr<AudioMixer> audio_mixer);
+
+  PeerConnectionFactory(
+      rtc::Thread* network_thread,
+      rtc::Thread* worker_thread,
+      rtc::Thread* signaling_thread,
+      AudioDeviceModule* default_adm,
+      rtc::scoped_refptr<webrtc::AudioEncoderFactory> audio_encoder_factory,
+      rtc::scoped_refptr<webrtc::AudioDecoderFactory> audio_decoder_factory,
+      cricket::WebRtcVideoEncoderFactory* video_encoder_factory,
+      cricket::WebRtcVideoDecoderFactory* video_decoder_factory,
+      rtc::scoped_refptr<AudioMixer> audio_mixer,
+      std::unique_ptr<cricket::MediaEngineInterface> media_engine,
+      std::unique_ptr<webrtc::CallFactoryInterface> call_factory,
+      std::unique_ptr<RtcEventLogFactoryInterface> event_log_factory);
   virtual ~PeerConnectionFactory();
 
  private:
-  std::unique_ptr<cricket::MediaEngineInterface> CreateMediaEngine_w();
+  std::unique_ptr<Call> CreateCall_w(RtcEventLog* event_log);
 
   bool owns_ptrs_;
   bool wraps_current_thread_;
@@ -145,6 +164,9 @@ class PeerConnectionFactory : public PeerConnectionFactoryInterface {
   // External audio mixer. This can be NULL. In that case, internal audio mixer
   // will be created and used.
   rtc::scoped_refptr<AudioMixer> external_audio_mixer_;
+  std::unique_ptr<cricket::MediaEngineInterface> media_engine_;
+  std::unique_ptr<webrtc::CallFactoryInterface> call_factory_;
+  std::unique_ptr<RtcEventLogFactoryInterface> event_log_factory_;
 };
 
 }  // namespace webrtc