Bug 1503132 do not shut down graph thread on completion of offline rendering r=padenot

AudioWorket will need to keep processing events on the graph thread.
The graph thread is instead shut down when the AudioContext is destroyed.

Depends on D10165

Differential Revision: https://phabricator.services.mozilla.com/D10166

--HG--
extra : moz-landing-system : lando

dom/media/MediaStreamGraph.cpp

@@ -1230,18 +1230,6 @@ MediaStreamGraphImpl::ProduceDataForStreamsBlockByBlock(uint32_t aStreamIndex,
                "Something went wrong with rounding to block boundaries");
 }
 
-bool
-MediaStreamGraphImpl::AllFinishedStreamsNotified()
-{
-  MOZ_ASSERT(OnGraphThread());
-  for (MediaStream* stream : AllStreams()) {
-    if (stream->mFinished && !stream->mNotifiedFinished) {
-      return false;
-    }
-  }
-  return true;
-}
-
 void
 MediaStreamGraphImpl::RunMessageAfterProcessing(UniquePtr<ControlMessage> aMessage)
 {
@@ -1451,7 +1439,6 @@ MediaStreamGraphImpl::UpdateMainThreadState()
   MOZ_ASSERT(OnGraphThread());
   MonitorAutoLock lock(mMonitor);
   bool finalUpdate = mForceShutDown ||
-    (mProcessedTime >= mEndTime && AllFinishedStreamsNotified()) ||
     (IsEmpty() && mBackMessageQueue.IsEmpty());
   PrepareUpdatesToMainThreadState(finalUpdate);
   if (finalUpdate) {

dom/media/MediaStreamGraphImpl.h

@@ -218,11 +218,6 @@ public:
    * mMonitor must be held.
    */
   void PrepareUpdatesToMainThreadState(bool aFinalUpdate);
-  /**
-   * Returns false if there is any stream that has finished but not yet finished
-   * playing out.
-   */
-  bool AllFinishedStreamsNotified();
   /**
    * If we are rendering in non-realtime mode, we don't want to send messages to
    * the main thread at each iteration for performance reasons. We instead