media: Opus support for WebM in Media Source

media/webm/webm_constants.h

Index: media/webm/webm_constants.h
diff --git a/media/webm/webm_constants.h b/media/webm/webm_constants.h
index cda45e00d4595767219976d584ec94c50b11d861..8764eebe11af9c5310450d5344305e4d221ecb38 100644
--- a/media/webm/webm_constants.h
+++ b/media/webm/webm_constants.h
@@ -57,6 +57,7 @@ const int kWebMIdChapterTranslateID = 0x69A5;
 const int kWebMIdChapterUID = 0x73C4;
 const int kWebMIdCluster = 0x1F43B675;
 const int kWebMIdCodecDecodeAll = 0xAA;
+const int kWebMIdCodecDelay = 0x56AA;
 const int kWebMIdCodecID = 0x86;
 const int kWebMIdCodecName = 0x258688;
 const int kWebMIdCodecPrivate = 0x63A2;
@@ -91,6 +92,7 @@ const int kWebMIdCueTrack = 0xF7;
 const int kWebMIdCueTrackPositions = 0xB7;
 const int kWebMIdDateUTC = 0x4461;
 const int kWebMIdDefaultDuration = 0x23E383;
+const int kWebMIdDiscardPadding = 0x75A2;
 const int kWebMIdDisplayHeight = 0x54BA;
 const int kWebMIdDisplayUnit = 0x54B2;
 const int kWebMIdDisplayWidth = 0x54B0;
@@ -147,6 +149,7 @@ const int kWebMIdSeek = 0x4DBB;
 const int kWebMIdSeekHead = 0x114D9B74;
 const int kWebMIdSeekID = 0x53AB;
 const int kWebMIdSeekPosition = 0x53AC;
+const int kWebMIdSeekPreRoll = 0x56BB;
 const int kWebMIdSegment = 0x18538067;
 const int kWebMIdSegmentFamily = 0x4444;
 const int kWebMIdSegmentFilename = 0x7384;