Introduce struct MediaConfig, with construction-time settings.

webrtc/media/base/videoengine_unittest.h

 /*
  *  Copyright (c) 2014 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 92 matching lines @@
 
   virtual cricket::VideoCodec DefaultCodec() = 0;
 
   virtual cricket::StreamParams DefaultSendStreamParams() {
     return cricket::StreamParams::CreateLegacy(kSsrc);
   }
 
   virtual void SetUp() {
     cricket::Device device("test", "device");
     engine_.Init();
-    channel_.reset(
-        engine_.CreateChannel(call_.get(), cricket::VideoOptions()));
+    channel_.reset(engine_.CreateChannel(call_.get(), cricket::MediaConfig(),
+                                         cricket::VideoOptions()));
     EXPECT_TRUE(channel_.get() != NULL);
     network_interface_.SetDestination(channel_.get());
     channel_->SetInterface(&network_interface_);
     media_error_ = cricket::VideoMediaChannel::ERROR_NONE;
     cricket::VideoRecvParameters parameters;
     parameters.codecs = engine_.codecs();
     channel_->SetRecvParameters(parameters);
     EXPECT_TRUE(channel_->AddSendStream(DefaultSendStreamParams()));
     video_capturer_.reset(CreateFakeVideoCapturer());
     cricket::VideoFormat format(640, 480,
@@ skipping 1057 matching lines @@
   rtc::scoped_ptr<C> channel_;
   cricket::FakeNetworkInterface network_interface_;
   cricket::FakeVideoRenderer renderer_;
   cricket::VideoMediaChannel::Error media_error_;
 
   // Used by test cases where 2 streams are run on the same channel.
   cricket::FakeVideoRenderer renderer2_;
 };
 
 #endif  // WEBRTC_MEDIA_BASE_VIDEOENGINE_UNITTEST_H_  NOLINT