Deactivate IDBTransactions created within Microtasks

Source/core/dom/Microtask.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef Microtask_h
 #define Microtask_h
 
 #include "public/platform/WebThread.h"
 #include "wtf/Functional.h"
 #include "wtf/PassOwnPtr.h"
+#include <v8.h>
 
 namespace blink {
 
 class Microtask {
 public:
     static void performCheckpoint();
+    static bool performingCheckpoint(v8::Isolate*);
     static void enqueueMicrotask(PassOwnPtr<WebThread::Task>);
     static void enqueueMicrotask(const Closure&);
 
 private:
     explicit Microtask();
 };
 
 } // namespace blink
 
 #endif // Microtask_h