Use sps and pps to determine decodability of H.264 frames.

webrtc/modules/video_coding/frame_buffer.cc

Index: webrtc/modules/video_coding/frame_buffer.cc
diff --git a/webrtc/modules/video_coding/frame_buffer.cc b/webrtc/modules/video_coding/frame_buffer.cc
index 1c7301f933c44f48a7b9933b585f7947eade7c46..465e051f4fcf30b55d0d2202fbb30f457bcc6b55 100644
--- a/webrtc/modules/video_coding/frame_buffer.cc
+++ b/webrtc/modules/video_coding/frame_buffer.cc
@@ -66,6 +66,10 @@ bool VCMFrameBuffer::NonReference() const {
   return _sessionInfo.NonReference();
 }
 
+std::vector<NaluInfo> VCMFrameBuffer::GetNaluInfos() const {
+  return _sessionInfo.GetNaluInfos();
+}
+
 void VCMFrameBuffer::SetGofInfo(const GofInfoVP9& gof_info, size_t idx) {
   _sessionInfo.SetGofInfo(gof_info, idx);
   // TODO(asapersson): Consider adding hdr->VP9.ref_picture_id for testing.