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

- put back VideoIsHardwareAccelerated (1ccd6a84d)
- Bug 1181204 - Prevent use of the decoder outside the reader's taskqueue. r=cpearce (3e85e4af1)
- Bug 1189173 - Drop frames aggressively during internal seek. r=jya (93be063d3)
- Bug 1179909: Build fix. r=me CLOSED TREE (5d35a65d5)
- part of Bug 1160321 - Test whether we can create H.264/AAC decoders before we report we support them. r=mattwoodrow (4efd2b497)
- Bug 1181439: Include init segment range when calling NotifyDataArrived. r=cpearce (fc3406016)
- Bug 1182933: Implement MediaReadAt. r=bholley (c285d05da)
- Bug 1179499 - Assert NS_IsMainThread on a bunch of MediaDecoder methods. r=jww (e6f0f3545)
- Bug 1179110 - Use a Maybe<> to store start time, rather than using -1 as a sentinel. r=jya (9e24b0223)
- bug 1161903 reset mDrainComplete after Flush() as DrainComplete() may be called before Flush() r=mattwoodrow (e49348af4)
- Bug 1171257 - Add force decode ahead to MediaFormatReader r=jya,bholley (5da27853d)
- Bug 1165825 - 1. Release the buffer which contains INFO_FORMAT_CHANGED. 2. Re-trigger the decode task if we still hold a promise. r=sotaro (f0d6c644f)
- Bug 1168778 - Fix crash when seeking: 1. Replace FlushableMediaTaskQueue by MediaTaskQueue. 2. Refact the seek/DecodeAudioDataTask/DecodeVideoFrameTask functions. r=sotaro (6341c41cb)
- put back mEOSVideoCompensation (d3cd0e1e8)
- Bug 1172390 - Align stream blocking of decoded stream with play state of MDSM. r=roc. (f44435942)
- Bug 1179665. Part 1 - move code that remove finished streams into DecodedStream so we don't need to expose GetReentrantMonitor() to the public and it is easier to remove it in the future. r=roc. (78c11a628)
- Bug 1179665. Part 2 - clean up mStreamStartTime since start time of MDSM is now always 0. r=roc. (92c38b802)
- partial  Bug 1140995 - Part 1 - At end of stream, send the last video frame to decoded stream with deviation usec if the last video frame's duration is 0. r=jwwang Bug 1140995 - Part 2: Don't send the audio/video data when the EOS flag is raised because the decoded data is invalid. r=cpearce (ec5a3096b)
- Bug 1179665. Part 3 - move code about sending stream data into DecodedStream. r=roc. (4cd542c56)
- fix space and patch order issues (b244ccd80)
- fix space and patch order issues (b47f0d460)
- Bug 1178718. Part 1 - Remove dependency on decoder monitor from DecodedStream. r=roc. (a92b7dcf4)
- Bug 1178718. Part 2 - No need to acquire the monitor in BreakCycles(). r=roc. (3bb146c76)
- Bug 1179665. Part 4 - remove MDSM::RecreateDecodedStream() which runs on the main thread and doesn't fit into the thread model of MDSM. r=roc. (f68c6c17e)
- Bug 1143575. Make GetClock return a TimeStamp as well as the stream time. r=cpearce (f216a2ed2)
- Bug 1143575. ScheduleStateMachine when the playback rate changes, so we can update the rendered frame queue. r=cpearce (498bf78cf)
- Bug 1143575. Rename clock_time to clockTime. r=cpearce (2d4267233)
- Bug 1143575. Keep currently-rendered frame at the front of the video queue. r=cpearce (6984d2ebc)
- Bug 1143575. Add frame IDs to VideoData. r=cpearce (d44122b91)
- Bug 1179499 - Dispatch NotifyPlayback{Started,Stopped}. r=jww (692af1608)
- Bug 1143575. Remove ClearAllImagesExceptFront because it doesn't do anything. r=nical (410ed1a6a)
- Bug 1143575. Clarify code by renaming method to ClearCurrentImageFromImageBridge. r=nical (97b431685)
- Bug 1143575. Make LayerTreeInvalidation invalidate when an ImageLayerComposite's current frame has changed. r=mattwoodrow (f6cf46087)
- Bug 1143575. Exit composition early if nothing is invalid. r=mattwoodrow (ded3bdf5d)
- Bug 1143575. Fix typo in ImageContainer comment. r=nical (2a372a0d3)
- Bug 1143575. Pass a list of timestamped images to ImageContainer::SetCurrentImages. r=nical (e3fec59dd)
- Bug 1143575. Implement ImageContainer::GetPaintDelay. r=nical (987f5c584)
- Bug 1143575. Implement ImageContainer::GetDroppedCount. r=nical (2e8e19731)

dom/base/nsDOMWindowUtils.cpp

@@ -28,7 +28,7 @@
 #include "ClientLayerManager.h"
 #include "nsQueryObject.h"
 #ifdef MOZ_FMP4
-#include "MP4Reader.h"
+#include "MP4Decoder.h"
 #endif
 
 #include "nsIScrollableFrame.h"
@@ -2264,7 +2264,7 @@ nsDOMWindowUtils::GetSupportsHardwareH264Decoding(bool* retval)
   if (!mgr)
     return NS_ERROR_FAILURE;
 
-  *retval = MP4Reader::IsVideoAccelerated(mgr->GetCompositorBackendType());
+  *retval = MP4Decoder::IsVideoAccelerated(mgr->GetCompositorBackendType());
 #else
   *retval = false;
 #endif