Wire up chrome field trials with webrtc.

content/renderer/media/media_stream_dependency_factory.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/media_stream_dependency_factory.h"
 
 #include <vector>
 
 #include "base/command_line.h"
+#include "base/metrics/field_trial.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/common/media/media_stream_messages.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/media/media_stream.h"
 #include "content/renderer/media/media_stream_audio_processor_options.h"
 #include "content/renderer/media/media_stream_audio_source.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/media_stream_video_track.h"
 #include "content/renderer/media/peer_connection_identity_service.h"
@@ skipping 14 matching lines @@
 #include "jingle/glue/thread_wrapper.h"
 #include "media/filters/gpu_video_accelerator_factories.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/libjingle/source/talk/app/webrtc/mediaconstraintsinterface.h"
+#include "third_party/webrtc/system_wrappers/interface/field_trial.h"
 
 #if defined(USE_OPENSSL)
 #include "third_party/libjingle/source/talk/base/ssladapter.h"
 #else
 #include "net/socket/nss_ssl_util.h"
 #endif
 
 #if defined(OS_ANDROID)
 #include "media/base/android/media_codec_bridge.h"
 #endif
@@ skipping 208 matching lines @@
 void MediaStreamDependencyFactory::CreatePeerConnectionFactory() {
   DCHECK(!pc_factory_.get());
   DCHECK(!signaling_thread_);
   DCHECK(!worker_thread_);
   DCHECK(!network_manager_);
   DCHECK(!socket_factory_);
   DCHECK(!chrome_worker_thread_.IsRunning());
 
   DVLOG(1) << "MediaStreamDependencyFactory::CreatePeerConnectionFactory()";
 
+  // Initialize webrtc field trial before start calling into webrtc code.
+  webrtc::FieldTrial::Init(&base::FieldTrialList::FindFullName);

[tommi (sloooow) - chröme, 2014/05/07 12:49:33]

Would InitializeWebRtcModule be a better place to call this function?
It gets called much earlier and at a more reliable point in time.

https://code.google.com/p/chromium/codesearch#chromium/src/third_party/libjin...

+
   jingle_glue::JingleThreadWrapper::EnsureForCurrentMessageLoop();
   jingle_glue::JingleThreadWrapper::current()->set_send_allowed(true);
   signaling_thread_ = jingle_glue::JingleThreadWrapper::current();
   CHECK(signaling_thread_);
 
   CHECK(chrome_worker_thread_.Start());
 
   base::WaitableEvent start_worker_event(true, false);
   chrome_worker_thread_.message_loop()->PostTask(FROM_HERE, base::Bind(
       &MediaStreamDependencyFactory::InitializeWorkerThread,
@@ skipping 372 matching lines @@
 }
 
 void MediaStreamDependencyFactory::EnsureWebRtcAudioDeviceImpl() {
   if (audio_device_)
     return;
 
   audio_device_ = new WebRtcAudioDeviceImpl();
 }
 
 }  // namespace content