Create & use microtask work queue

Source/core/html/parser/HTMLScriptRunner.cpp

Index: Source/core/html/parser/HTMLScriptRunner.cpp
diff --git a/Source/core/html/parser/HTMLScriptRunner.cpp b/Source/core/html/parser/HTMLScriptRunner.cpp
index c8b9c6c27c7c249580a1311b6283b399f930d481..a6417da8f42b8c7a8943a78f8c0ef9b28c114695 100644
--- a/Source/core/html/parser/HTMLScriptRunner.cpp
+++ b/Source/core/html/parser/HTMLScriptRunner.cpp
@@ -126,7 +126,7 @@ void HTMLScriptRunner::executePendingScriptAndDispatchEvent(PendingScript& pendi
         stopWatchingForLoad(pendingScript);
 
     if (!isExecutingScript())
-        Microtask::performCheckpoint();
+        Microtask::performMicrotaskCheckpoint();
 
     // Clear the pending script before possible rentrancy from executeScript()
     RefPtr<Element> element = pendingScript.releaseElementAndClear();
@@ -290,7 +290,7 @@ void HTMLScriptRunner::runScript(Element* script, const TextPosition& scriptStar
         // unfortuantely no obvious way to tell if prepareScript is going to
         // execute the script from out here.
         if (!isExecutingScript())
-            Microtask::performCheckpoint();
+            Microtask::performMicrotaskCheckpoint();
 
         InsertionPointRecord insertionPointRecord(m_host->inputStream());
         NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);