import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1197669 - Part1 - 1.Enable the testcase on B2G. 2. fix the mimetype check in testcase. r=jwwang (9bbae092f)
- Bug 1197669 - Part2 - 1. Ensure the EOS is sent to MediaCodec. 2. mEndOfStream should be protected by monitor. r=sotaro (62b8e66b7)
- bug 1193922 skip SetIsOnlyNodeForContext after shutdown r=padenot (df991d0af)
- Minor (1d695f7c4)
- Bug 1197051 - Don't try to decode ahead while seeking - r=jya (7d8d877ad)
- Bug 1197075: P1. Revert "Bug 1197051 - Don't try to decode ahead while seeking - r=jya". r=edwin (e837b12e3)
- Bug 1143575. Push all available frames to the compositor. r=cpearce (109e54ae8)
- partial of  Bug 1197075: P2. Revert "Bug 1171257 - Add force decode ahead to MediaFormatReader r=jya,bholley". r=edwin (5f4859e47)
- Minor (a841ca407)
- Bug 1199155. Part 2 - fix includes and forward declarations. r=roc. (ca523595a)
- Bug 1199155. Part 1 - move dom/media/DecodedStream.* to dom/media/mediasink/ and implement the interface of MediaSink. r=roc. (90b376a24)
- Bug 1199155. Part 3 - rename mDecodedStream to mStreamSink. r=roc. (1aae54328)
- Bug 1203374. Part 1 - extract the code of computing canplaythrough so it is reusable. r=jya. (acc5fc8c6)
- Bug 1203374. Part 2 - duplicate the implementation of MediaDecoder::CanPlayThrough so MDSM can call its own CanPlayThrough() on its own thread. r=jya. (a042541a8)
- Bug 1182928 - Disable dormant mode for EME videos in Firefox Beta and Release. r=sotaro (ea5964ae9)
- Bug 1197022 - [EME] Disable dormant mode for EME videos on all channels. r=kentuckyfriedtakahe (742d00672)
- Bug 1179110 - Fix ComputePlaybackRate. r=jww (a43272af5)
- Bug 1178622 - Fix enum-to-string mismatch in MediaDecoder.cpp. r=jya. (b9da7ebf3)
- Bug 1203418. Part 1 - cache the results of ComputePlaybackRate() so they can be mirrored by MDSM. r=cpearce. (95f7ac068)
- Bug 1203418. Part 2 - duplicate the implementation of MediaDecoder::GetStatistics so MDSM can call it on its own thread. r=cpearce. (2755b85a7)
- Bug 1203418. Part 3 - ensure MDSM::mPlaybackOffset and MediaDecoder::mPlaybackPosition are mono-increasing to avoid "jitter" in calculating playback statistics. r=cpearce. (54dcb6219)
- Bug 1104616 - Proxy video capture access to the main process. r=jesup,glandium,mrbkap (cfdd08459)
- Bug 1200614 - Protect the capture engines array from concurrent access (during shutdown). r=jesup (c4dbd6e10)
- Bug 1200614 - Check whether engines are still alive when webrtc ops run. r=jesup (d42d3474f)
- Bug 1194640 - add NSPR logging of camera capabilities, r=jesup (c7365b916)
- Bug 1204413 - Make MediaDecoder::IsTransportSeekable run on the main thread. r=kinetik. (098868b0d)
- Bug 1198202 - Increase hardware video decoding fallback threshold. r=ajones (1059f9b0f)
- Bug 1201197 - add dedicated listener to enumerateDevices. r=jesup (a51477957)
- Bug 1199562. Part 1 - rename mAudioSink to mMediaSink as well as related member names. r=roc. (c2db1b4d4)
- Bug 1199562. Part 2 - replace usage of mStreamSink with mMediaSink in most cases. r=roc. (7aa0754c4)
- Bug 1199562. Part 3 - remove unused code. r=roc. (343c5be2f)
- Bug 1203877 - Remove MediaDecoder::UpdatePlaybackOffset. r=kinetik. (4476dd1f8)
- Bug 1204430. Part 2 - mirror MediaDecoder::mMediaSeekable. r=kinetik. (51ca1197d)
- Bug 1206576 - Dispatch some MDSM functions to hide its internal thread model. r=jya. (74b9a169c)
- Bug 1206574 - Remove AbstractMediaDecoder::IsShutdown(). r=cpearce. (4ed17a27f)
- Bug 1207017. Part 1 - fix coding styles. r=kinetik. (cc10a28c3)
- Bug 1207017. Part 2 - remove duplicated GetStateMachine(). r=kinetik. (19b663098)
- Bug 1200477 - Allow building with WebRTC disabled. r=glandium,mrbkap (56055c3c7)

dom/media/encoder/VP8TrackEncoder.cpp

@@ -448,6 +448,7 @@ VP8TrackEncoder::GetEncodedTrack(EncodedFrameContainer& aData)
 {
   PROFILER_LABEL("VP8TrackEncoder", "GetEncodedTrack",
     js::ProfileEntry::Category::OTHER);
+  bool EOS;
   {
     // Move all the samples from mRawSegment to mSourceSegment. We only hold
     // the monitor in this block.
@@ -463,6 +464,7 @@ VP8TrackEncoder::GetEncodedTrack(EncodedFrameContainer& aData)
       return NS_ERROR_FAILURE;
     }
     mSourceSegment.AppendFrom(&mRawSegment);
+    EOS = mEndOfStream;
   }
 
   VideoSegment::ChunkIterator iter(mSourceSegment);
@@ -536,7 +538,7 @@ VP8TrackEncoder::GetEncodedTrack(EncodedFrameContainer& aData)
   VP8LOG("RemoveLeading %lld\n",totalProcessedDuration);
 
   // End of stream, pull the rest frames in encoder.
-  if (mEndOfStream) {
+  if (EOS) {
     VP8LOG("mEndOfStream is true\n");
     mEncodingComplete = true;
     if (vpx_codec_encode(mVPXContext, nullptr, mEncodedTimestamp,