Revert "Bug 1993981 - Rename MediaTrackGraphImpl::LifecycleStateRef() -> LifecycleState() and return state by value. r=karlt" for causing bustage @ AbstractThread.h and Gtest failures @ StateWatching.h

This reverts commit 86b579e.

Revert "Bug 1993981 - Unit test graph shutdown message ordering. r=karlt"

This reverts commit 1a7e168.

Revert "Bug 1993981 - Introduce an atomicity policy for tail dispatch. r=karlt,xpcom-reviewers,nika,webrtc-reviewers,bwc,media-playback-reviewers"

This reverts commit 3eba0a2.

Revert "Bug 1993981 - Unit test message atomicity. r=karlt"

This reverts commit edde7ff.

Revert "Bug 1993981 - Unit test event ordering between the graph and main thread. r=karlt"

This reverts commit 8641979.

Revert "Bug 1993981 - To MockProcessedMediaTrack add mocks for {Add|Remove}ListenerImpl. r=karlt"

This reverts commit 165e177.

Revert "Bug 1993981 - In MediaTrackGraphImpl natively support AudioWorklet's message passing. r=karlt"

This reverts commit 7365f2d.

Revert "Bug 1993981 - Implement AbstractThread for MediaTrackGraphImpl. r=karlt"

This reverts commit 7cdca42.

Revert "Bug 1993981 - Rename MediaTrackGraphImpl::Dispatch to DispatchToMainThread to avoid naming conflicts with nsISerialEventTarget. r=karlt"

This reverts commit 186f4c8.

Revert "Bug 1993981 - Allow canceling cancelable and discardable tail-dispatched runnables. r=xpcom-reviewers,nika"

This reverts commit 5c0ae53.

Revert "Bug 1993981 - Implement nsIDirectTaskDispatcher for MediaTrackGraphImpl. r=karlt"

This reverts commit 05da491.

Revert "Bug 1993981 - Store ControlMessages as runnables. r=karlt"

This reverts commit 68a2b11.

Author: Norisz Fay

dom/media/MediaDecoderStateMachineBase.cpp

@@ -36,7 +36,7 @@ MediaDecoderStateMachineBase::MediaDecoderStateMachineBase(
       mVideoFrameContainer(aDecoder->GetVideoFrameContainer()),
       mTaskQueue(TaskQueue::Create(GetMediaThreadPool(MediaThreadType::MDSM),
                                    "MDSM::mTaskQueue",
-                                   TailDispatchPolicy::ConsistentOrdering)),
+                                   /* aSupportsTailDispatch = */ true)),
       mReader(new ReaderProxy(mTaskQueue, aReader)),
       mPlaybackRate(1.0),
       INIT_MIRROR(mBuffered, media::TimeIntervals()),

dom/media/MediaFormatReader.cpp

@@ -901,7 +901,7 @@ MediaFormatReader::MediaFormatReader(MediaFormatReaderInit& aInit,
     : mTaskQueue(
           TaskQueue::Create(GetMediaThreadPool(MediaThreadType::SUPERVISOR),
                             "MediaFormatReader::mTaskQueue",
-                            TailDispatchPolicy::ConsistentOrdering)),
+                            /* aSupportsTailDispatch = */ true)),
       mAudio(this, MediaData::Type::AUDIO_DATA,
              StaticPrefs::media_audio_max_decode_error()),
       mVideo(this, MediaData::Type::VIDEO_DATA,

dom/media/MediaManager.cpp

@@ -2544,14 +2544,15 @@ MediaManager* MediaManager::Get() {
     timesCreated++;
     MOZ_RELEASE_ASSERT(timesCreated == 1);
 
+    constexpr bool kSupportsTailDispatch = false;
     RefPtr<TaskQueue> mediaThread =
 #ifdef MOZ_WEBRTC
         CreateWebrtcTaskQueueWrapper(
             GetMediaThreadPool(MediaThreadType::SUPERVISOR), "MediaManager"_ns,
-            TailDispatchPolicy::NoTailDispatch);
+            kSupportsTailDispatch);
 #else
         TaskQueue::Create(GetMediaThreadPool(MediaThreadType::SUPERVISOR),
-                          "MediaManager", TailDispatchPolicy::NoTailDispatch);
+                          "MediaManager", kSupportsTailDispatch);
 #endif
     LOG("New Media thread for gum");