Late initialize MediaController, for less resource i.e. ProcessThread, usage by PeerConnection.

webrtc/api/peerconnectioninterface_unittest.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 2346 matching lines @@
     pcf_->Initialize();
   }
   const cricket::MediaConfig& TestCreatePeerConnection(
       const PeerConnectionInterface::RTCConfiguration& config,
       const MediaConstraintsInterface *constraints) {
     pcf_->create_media_controller_called_ = false;
 
     scoped_refptr<PeerConnectionInterface> pc(
         pcf_->CreatePeerConnection(config, constraints, nullptr, nullptr,
                                    &observer_));
+    {
+      // The MediaController is lazy initialized so in order for the below
+      // expectations not to fail, we need to trigger creation.
+      rtc::scoped_refptr<RtpSenderInterface> sender(
+          pc->CreateSender(MediaStreamTrackInterface::kAudioKind, "foo_id"));
+    }
     EXPECT_TRUE(pc.get());
     EXPECT_TRUE(pcf_->create_media_controller_called_);
     return pcf_->create_media_controller_config_;
   }
 
   scoped_refptr<PeerConnectionFactoryForTest> pcf_;
   MockPeerConnectionObserver observer_;
 };
 
 // This test verifies the default behaviour with no constraints and a
@@ skipping 211 matching lines @@
   FakeConstraints updated_answer_c;
   answer_c.SetMandatoryReceiveAudio(false);
   answer_c.SetMandatoryReceiveVideo(false);
 
   cricket::MediaSessionOptions updated_answer_options;
   EXPECT_TRUE(
       ParseConstraintsForAnswer(&updated_answer_c, &updated_answer_options));
   EXPECT_TRUE(updated_answer_options.has_audio());
   EXPECT_TRUE(updated_answer_options.has_video());
 }