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diff --git a/third_party/WebKit/Source/bindings/core/v8/Microtask.h b/third_party/WebKit/Source/bindings/core/v8/Microtask.h
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+/*
+ * 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
+ *    notice, this list of conditions and the following disclaimer
+ *    in the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name of Google Inc. nor the names of its contributors
+ *    may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (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 "core/CoreExport.h"
+#include "public/platform/WebTaskRunner.h"
+#include "wtf/Allocator.h"
+#include "wtf/Functional.h"
+#include "wtf/PassOwnPtr.h"
+#include <v8.h>
+
+namespace blink {
+
+// C++ calls into script contexts which are "owned" by blink (created in a
+// process where WebKit.cpp initializes v8) must declare their type:
+//
+//   1. Calls into page/author script from a frame
+//   2. Calls into page/author script from a worker
+//   3. Calls into internal script (typically setup/teardown work)
+//
+// Debug-time checking of this is enforced via v8::MicrotasksScope.
+//
+// Calls of type (1) should generally go through ScriptController, as inspector
+// instrumentation is needed. ScriptController allocates V8RecursionScope for you.
+//
+// Calls of type (2) should always stack-allocate a v8::MicrotasksScope(kRunMicrtoasks)
+// in the same block as the call into script.
+//
+// Calls of type (3) should stack allocate a v8::MicrotasksScope(kDoNotRunMicrotasks) --
+// this skips work that is spec'd to happen at the end of the outer-most
+// script stack frame of calls into page script:
+// http://www.whatwg.org/specs/web-apps/current-work/#perform-a-microtask-checkpoint
+class CORE_EXPORT Microtask {
+    STATIC_ONLY(Microtask);
+public:
+    static void performCheckpoint(v8::Isolate*);
+
+    // TODO(jochen): Make all microtasks pass in the ScriptState they want to be
+    // executed in. Until then, all microtasks have to keep track of their
+    // ScriptState themselves.
+    static void enqueueMicrotask(PassOwnPtr<WebTaskRunner::Task>);
+    static void enqueueMicrotask(PassOwnPtr<SameThreadClosure>);
+};
+
+} // namespace blink
+
+#endif // Microtask_h