Preparation CL for H264 support in WebRTC.

content/renderer/media/webrtc/peer_connection_dependency_factory.cc

Index: content/renderer/media/webrtc/peer_connection_dependency_factory.cc
diff --git a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
index 270cf169851d51f21a8a5377d7bacf87f2b222e7..be2cad5a1de794e4272103bc0cf8ee3831b075d8 100644
--- a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
+++ b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
@@ -52,9 +52,11 @@
 #include "content/renderer/render_frame_impl.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/render_view_impl.h"
+#include "content/renderer/renderer_features.h"
 #include "crypto/openssl_util.h"
 #include "jingle/glue/thread_wrapper.h"
 #include "media/base/media_permission.h"
+#include "media/filters/ffmpeg_glue.h"
 #include "media/renderers/gpu_video_accelerator_factories.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
@@ -259,6 +261,13 @@ void PeerConnectionDependencyFactory::CreatePeerConnectionFactory() {
 
   DVLOG(1) << "PeerConnectionDependencyFactory::CreatePeerConnectionFactory()";
 
+#if BUILDFLAG(RTC_USE_H264)
+  // When building with |rtc_use_h264|, |H264DecoderImpl| may be used which
+  // depends on FFmpeg, therefore we need to initialize FFmpeg before going
+  // further.
+  media::FFmpegGlue::InitializeFFmpeg();
+#endif
+
   base::MessageLoop::current()->AddDestructionObserver(this);
   // To allow sending to the signaling/worker threads.
   jingle_glue::JingleThreadWrapper::EnsureForCurrentMessageLoop();