Create & use microtask work queue

Source/bindings/v8/V8PerIsolateData.h

Index: Source/bindings/v8/V8PerIsolateData.h
diff --git a/Source/bindings/v8/V8PerIsolateData.h b/Source/bindings/v8/V8PerIsolateData.h
index 28dcd09b7f85cc4a91dbac6fc0f4f12257a0bcd6..b24e5a13159bd8da68d1a961bf222465d9aee9a1 100644
--- a/Source/bindings/v8/V8PerIsolateData.h
+++ b/Source/bindings/v8/V8PerIsolateData.h
@@ -104,6 +104,9 @@ public:
     int incrementRecursionLevel() { return ++m_recursionLevel; }
     int decrementRecursionLevel() { return --m_recursionLevel; }
 
+    bool performingCheckpoint() const { return m_performingCheckpoint; }

[adamk, 2014/01/29 22:58:24]

I know it's horribly long, but can you make this
performingMicrotaskCheckpoint()? Without the "microtask" its purpose is only
clear from reading the caller.

[rafaelw, 2014/01/29 23:18:52]

Done.

+    void setPerformingCheckpoint(bool performingCheckpoint) { m_performingCheckpoint = performingCheckpoint; }
+
 #ifndef NDEBUG
     int internalScriptRecursionLevel() const { return m_internalScriptRecursionLevel; }
     int incrementInternalScriptRecursionLevel() { return ++m_internalScriptRecursionLevel; }
@@ -163,6 +166,7 @@ private:
 #endif
     OwnPtr<GCEventData> m_gcEventData;
     bool m_shouldCollectGarbageSoon;
+    bool m_performingCheckpoint;
 };
 
 } // namespace WebCore