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

webrtc/modules/video_coding/session_info.h

Index: webrtc/modules/video_coding/session_info.h
diff --git a/webrtc/modules/video_coding/session_info.h b/webrtc/modules/video_coding/session_info.h
index e9ff25166d6fff12c85e6f06525b648869098f3e..e4441fd3363516755aca02a0a047307424631c6d 100644
--- a/webrtc/modules/video_coding/session_info.h
+++ b/webrtc/modules/video_coding/session_info.h
@@ -12,6 +12,7 @@
 #define WEBRTC_MODULES_VIDEO_CODING_SESSION_INFO_H_
 
 #include <list>
+#include <vector>
 
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/modules/video_coding/include/video_coding.h"
@@ -88,6 +89,8 @@ class VCMSessionInfo {
   int Tl0PicId() const;
   bool NonReference() const;
 
+  std::vector<NaluInfo> GetNaluInfos() const;
+
   void SetGofInfo(const GofInfoVP9& gof_info, size_t idx);
 
   // The number of packets discarded because the decoder can't make use of