Bug 1419305 - Part 1: Use MicroTask on CustomElements correctly; r=smaug

MozReview-Commit-ID: EPMfr6hr5fS

--HG--
extra : rebase_source : 51784f7d8b74978847901f57f23730fb0f547ce5

dom/base/CustomElementRegistry.cpp

@@ -1018,9 +1018,8 @@ CustomElementReactionsStack::Enqueue(Element* aElement,
   }
 
   CycleCollectedJSContext* context = CycleCollectedJSContext::Get();
-  RefPtr<ProcessBackupQueueRunnable> processBackupQueueRunnable =
-    new ProcessBackupQueueRunnable(this);
-  context->DispatchToMicroTask(processBackupQueueRunnable.forget());
+  RefPtr<BackupQueueMicroTask> bqmt = new BackupQueueMicroTask(this);
+  context->DispatchMicroTaskRunnable(bqmt.forget());
 }
 
 void

dom/base/CustomElementRegistry.h

@@ -313,12 +313,11 @@ private:
   void Enqueue(Element* aElement, CustomElementReaction* aReaction);
 
 private:
-  class ProcessBackupQueueRunnable : public mozilla::Runnable {
+  class BackupQueueMicroTask final : public mozilla::MicroTaskRunnable {
     public:
-      explicit ProcessBackupQueueRunnable(
+      explicit BackupQueueMicroTask(
         CustomElementReactionsStack* aReactionStack)
-        : Runnable(
-            "dom::CustomElementReactionsStack::ProcessBackupQueueRunnable")
+        : MicroTaskRunnable()
         , mReactionStack(aReactionStack)
       {
         MOZ_ASSERT(!mReactionStack->mIsBackupQueueProcessing,
@@ -326,11 +325,10 @@ private:
         mReactionStack->mIsBackupQueueProcessing = true;
       }
 
-      NS_IMETHOD Run() override
+      virtual void Run(AutoSlowOperation& aAso) override
       {
         mReactionStack->InvokeBackupQueue();
         mReactionStack->mIsBackupQueueProcessing = false;
-        return NS_OK;
       }
 
     private: