libvpx: Pull from upstream

source/libvpx/third_party/libwebm/webmids.hpp

Index: source/libvpx/third_party/libwebm/webmids.hpp
diff --git a/source/libvpx/third_party/libwebm/webmids.hpp b/source/libvpx/third_party/libwebm/webmids.hpp
index 6874e44e96535f8c9f7029673f3787161b7e9323..ad4ab5738894f577401d8ad5e0c815adb4d065c7 100644
--- a/source/libvpx/third_party/libwebm/webmids.hpp
+++ b/source/libvpx/third_party/libwebm/webmids.hpp
@@ -41,6 +41,7 @@ enum MkvId {
   kMkvTimecodeScale = 0x2AD7B1,
   kMkvDuration = 0x4489,
   kMkvDateUTC = 0x4461,
+  kMkvTitle = 0x7BA9,
   kMkvMuxingApp = 0x4D80,
   kMkvWritingApp = 0x5741,
   // Cluster
@@ -107,9 +108,16 @@ enum MkvId {
   kMkvContentEncodingOrder = 0x5031,
   kMkvContentEncodingScope = 0x5032,
   kMkvContentEncodingType = 0x5033,
+  kMkvContentCompression = 0x5034,
+  kMkvContentCompAlgo = 0x4254,
+  kMkvContentCompSettings = 0x4255,
   kMkvContentEncryption = 0x5035,
   kMkvContentEncAlgo = 0x47E1,
   kMkvContentEncKeyID = 0x47E2,
+  kMkvContentSignature = 0x47E3,
+  kMkvContentSigKeyID = 0x47E4,
+  kMkvContentSigAlgo = 0x47E5,
+  kMkvContentSigHashAlgo = 0x47E6,
   kMkvContentEncAESSettings = 0x47E7,
   kMkvAESSettingsCipherMode = 0x47E8,
   kMkvAESSettingsCipherInitData = 0x47E9,