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

- Bug 1161590 - Ignore blocklist preference in nightly and aurora. r=jrmuizelaar (47ec8bee6)
- Bug 1162299 - Distinguish between all features and unrecognized feature. r=kats (e9705844f)
- Add compositor, layers, and rendering info to nsIGfxInfo. (bug 1179051 part 5, r=mattwoodrow) (b4e6da05f)
- Bug 1186002. Avoid testing for recreate on broken drivers. r=dvander (10506f4f2)
- Bug 1156407 - part 1 - use static_assert instead of PR_STATIC_ASSERT; r=mccr8 (ff53e05ba)
- Bug 1156407 - part 2 - make CALLBACK_TYPE enum a private implementation detail of nsTimerImpl; r=mccr8 (de0cc6527)
- Bug 1156407 - part 3 - get rid of NS_NewTimer; r=mccr8 (c598b96e0)
- Bug 1095433: fix the race condition in the Task Tracer that crashes processes forked from Nuwa. r=tlee (cffe07827)
- Bug 1113562 - Expected delay time of tasks should not be the latency of those kind. r=sinker (f422ae04e)
- Bug 1155059: Patch 1&2 - Convert Dispatch() and friends to already_AddRefed<> r=froydnj (2ca9850af)
- Bug 1155059: Patch 4 - invoke NS_ASSERTION if DispatchToMainThread fails to get MainThread ptr r=froydnj (651903c22)
- Bug 1155059: Patch 3&7 - fix leaks in Promise, ConsoleService and JS Finalize r=froydnj (b57cb08d9)
- Bug 1155059: Patch 5 - clean up ServiceWorkers and avoid leaks r=nikhil (666245af8)
- Bug 1155059: Patch 6 - fix problems with gfxFontInfoLoader shutdown sequence r=jdaggett (332e8bd76)
- Bug 1155059: Patch 8 - Don't leak runnables when MediaCache/FileBlockCache get shut down after XPCOM is in final shutdown r=cpearce (18f36fa25)
- Bug 1155059: Patch 9 - Modify DataChannel.cpp to use updated API r=froydnj (c5415703c)
- Bug 1176446 - TextureClientD3D11 should take into account the layer backend when allocating a surface. r=bas (3c1b59296)
- Bug 1176363 - Part 1: Stop using DrawTargets off the main thread. r=mattwoodrow (624e8107a)
- Bug 1176363 - Part 2: Allow mapping of SourceSurfaceRawData from multiple threads. r=bas (38c8363cf)
- Fix d3d11 texture sharing checks being preserved across device resets. (bug 1183910 part 6, r=mattwoodrow) (658121c50)
- Clear the blur cache after device resets. (bug 1188032, r=bas) (c362b2ec6)

xpcom/threads/nsThreadPool.cpp

@@ -66,6 +66,13 @@ nsThreadPool::~nsThreadPool()
 
 nsresult
 nsThreadPool::PutEvent(nsIRunnable* aEvent)
+{
+  nsCOMPtr<nsIRunnable> event(aEvent);
+  return PutEvent(event.forget());
+}
+
+nsresult
+nsThreadPool::PutEvent(already_AddRefed<nsIRunnable>&& aEvent)
 {
   // Avoid spawning a new thread while holding the event queue lock...
 
@@ -89,7 +96,7 @@ nsThreadPool::PutEvent(nsIRunnable* aEvent)
       spawnThread = true;
     }
 
-    mEvents.PutEvent(aEvent);
+    mEvents.PutEvent(Move(aEvent));
     stackSize = mStackSize;
   }
 
@@ -235,9 +242,16 @@ nsThreadPool::Run()
 }
 
 NS_IMETHODIMP
-nsThreadPool::Dispatch(nsIRunnable* aEvent, uint32_t aFlags)
+nsThreadPool::DispatchFromScript(nsIRunnable* aEvent, uint32_t aFlags)
 {
-  LOG(("THRD-P(%p) dispatch [%p %x]\n", this, aEvent, aFlags));
+  nsCOMPtr<nsIRunnable> event(aEvent);
+  return Dispatch(event.forget(), aFlags);
+}
+
+NS_IMETHODIMP
+nsThreadPool::Dispatch(already_AddRefed<nsIRunnable>&& aEvent, uint32_t aFlags)
+{
+  LOG(("THRD-P(%p) dispatch [%p %x]\n", this, /* XXX aEvent*/ nullptr, aFlags));
 
   if (NS_WARN_IF(mShutdown)) {
     return NS_ERROR_NOT_AVAILABLE;
@@ -251,7 +265,7 @@ nsThreadPool::Dispatch(nsIRunnable* aEvent, uint32_t aFlags)
     }
 
     nsRefPtr<nsThreadSyncDispatch> wrapper =
-      new nsThreadSyncDispatch(thread, aEvent);
+      new nsThreadSyncDispatch(thread, Move(aEvent));
     PutEvent(wrapper);
 
     while (wrapper->IsPending()) {
@@ -259,7 +273,7 @@ nsThreadPool::Dispatch(nsIRunnable* aEvent, uint32_t aFlags)
     }
   } else {
     NS_ASSERTION(aFlags == NS_DISPATCH_NORMAL, "unexpected dispatch flags");
-    PutEvent(aEvent);
+    PutEvent(Move(aEvent));
   }
   return NS_OK;
 }