Integrate VDA with WebRTC.

content/renderer/media/media_stream_dependency_factory.cc

Index: content/renderer/media/media_stream_dependency_factory.cc
diff --git a/content/renderer/media/media_stream_dependency_factory.cc b/content/renderer/media/media_stream_dependency_factory.cc
index a0f8468699f59b71399f6330c54ccc55ea517dc6..0d28505b6017c5bed883cc0434e62b3dcf299977 100644
--- a/content/renderer/media/media_stream_dependency_factory.cc
+++ b/content/renderer/media/media_stream_dependency_factory.cc
@@ -11,9 +11,11 @@
 #include "base/utf_string_conversions.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/media/media_stream_source_extra_data.h"
+#include "content/renderer/media/renderer_gpu_video_decoder_factories.h"
 #include "content/renderer/media/rtc_media_constraints.h"
 #include "content/renderer/media/rtc_peer_connection_handler.h"
 #include "content/renderer/media/rtc_video_capturer.h"
+#include "content/renderer/media/rtc_video_decoder_factory.h"
 #include "content/renderer/media/video_capture_impl_manager.h"
 #include "content/renderer/media/webaudio_capturer_source.h"
 #include "content/renderer/media/webrtc_audio_device_impl.h"
@@ -479,9 +481,28 @@ bool MediaStreamDependencyFactory::CreatePeerConnectionFactory() {
   if (!pc_factory_) {
     DCHECK(!audio_device_);
     audio_device_ = new WebRtcAudioDeviceImpl();
+
+    const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
+    scoped_ptr<RTCVideoDecoderFactory> decoder_factory;
+    scoped_refptr<content::RendererGpuVideoDecoderFactories> gpu_factories;
+    if (cmd_line->HasSwitch(switches::kEnableWebRTCHWDecoding)) {
+      scoped_ptr<base::Thread> vda_thread(new base::Thread("VDA_thread"));
+      if (vda_thread->Start()) {
+        gpu_factories = RenderThreadImpl::current()->GetGpuFactories(
+            vda_thread->message_loop_proxy());
+      } else {
+        LOG(ERROR) << "Could not start VDA thread";
+      }
+      if (gpu_factories != NULL) {
+        decoder_factory.reset(
+            new RTCVideoDecoderFactory(gpu_factories, vda_thread.Pass()));
+      }
+    }
+
     scoped_refptr<webrtc::PeerConnectionFactoryInterface> factory(
         webrtc::CreatePeerConnectionFactory(
-            worker_thread_, signaling_thread_, audio_device_, NULL, NULL));
+            worker_thread_, signaling_thread_, audio_device_, NULL,
+            decoder_factory.release()));
     if (factory)
       pc_factory_ = factory;
     else