Bug 1700492 - add some new debug log for MSE. r=bryce

Differential Revision: https://phabricator.services.mozilla.com/D109563

dom/media/mediasource/TrackBuffersManager.cpp

@@ -1285,6 +1285,7 @@ void TrackBuffersManager::OnDemuxerInitDone(const MediaResult& aResult) {
     // 5. If the first initialization segment received flag is false, then run
     // the following steps:
     if (!mFirstInitializationSegmentReceived) {
+      MSE_DEBUG("Get first init data");
       mAudioTracks.mNumTracks = numAudios;
       // TODO:
       // 1. If the initialization segment contains tracks with codecs the user
@@ -1420,6 +1421,7 @@ void TrackBuffersManager::OnDemuxerInitDone(const MediaResult& aResult) {
       // 6. Set first initialization segment received flag to true.
       mFirstInitializationSegmentReceived = true;
     } else {
+      MSE_DEBUG("Get new init data");
       mAudioTracks.mLastInfo = new TrackInfoSharedPtr(info.mAudio, streamID);
       mVideoTracks.mLastInfo = new TrackInfoSharedPtr(info.mVideo, streamID);
     }
@@ -1475,6 +1477,7 @@ void TrackBuffersManager::OnDemuxerInitDone(const MediaResult& aResult) {
 }
 
 void TrackBuffersManager::OnDemuxerInitFailed(const MediaResult& aError) {
+  MSE_DEBUG("");
   MOZ_ASSERT(aError != NS_ERROR_DOM_MEDIA_WAITING_FOR_DATA);
   mDemuxerInitRequest.Complete();