Fix SPS/PPS insertion logic in MP4StreamParser.

media/formats/mp4/avc.h

Index: media/formats/mp4/avc.h
diff --git a/media/formats/mp4/avc.h b/media/formats/mp4/avc.h
index 731e4012b4079347d12e7596488906c3efdcfa4b..8917543d37acba424a6c4a9c348ab41e41f4ee25 100644
--- a/media/formats/mp4/avc.h
+++ b/media/formats/mp4/avc.h
@@ -19,9 +19,21 @@ class MEDIA_EXPORT AVC {
  public:
   static bool ConvertFrameToAnnexB(int length_size, std::vector<uint8>* buffer);
 
+  // Inserts the SPS & PPS data from |avc_config| into |buffer|.
+  // |buffer| is expected to contain AnnexB conformant data.
+  // Returns true if the param sets were successfully inserted.
+  static bool InsertParamSetsAnnexB(
+      const AVCDecoderConfigurationRecord& avc_config,
+      std::vector<uint8>* buffer);
+
   static bool ConvertConfigToAnnexB(
       const AVCDecoderConfigurationRecord& avc_config,
       std::vector<uint8>* buffer);
+
+  // Verifies that the contents of |buffer| conform to
+  // Section 7.4.1.2.3 of ISO/IEC 14496-10.
+  // Returns true if |buffer| contains conformant AnnexB data.
+  static bool IsValidAnnexB(const std::vector<uint8>& buffer);
 };
 
 }  // namespace mp4