Implement support for vp9 in ISO-BMFF

media/base/key_systems.cc

Index: media/base/key_systems.cc
diff --git a/media/base/key_systems.cc b/media/base/key_systems.cc
index 914661f580e653f88c960cb30c08b5efd16426fb..16902fd6eae9c613422c5febd031eb7570ca12ce 100644
--- a/media/base/key_systems.cc
+++ b/media/base/key_systems.cc
@@ -17,6 +17,7 @@
 #include "media/base/key_system_info.h"
 #include "media/base/media_client.h"
 #include "media/cdm/key_system_names.h"
+#include "media/media_features.h"
 #include "third_party/widevine/cdm/widevine_cdm_common.h"
 
 namespace media {
@@ -53,6 +54,9 @@ static const NamedCodec kCodecStrings[] = {
     {"vp9", EME_CODEC_WEBM_VP9},        // VP9.
     {"vp9.0", EME_CODEC_WEBM_VP9},      // VP9.
 #if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(ENABLE_MP4_VP9_DEMUXING)
+    {"vp09", EME_CODEC_MP4_VP9},  // VP9 in MP4.
+#endif
     {"mp4a", EME_CODEC_MP4_AAC},   // AAC.
     {"avc1", EME_CODEC_MP4_AVC1},  // AVC1.
     {"avc3", EME_CODEC_MP4_AVC1}   // AVC3.