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diff --git a/chromium/third_party/WebKit/Source/platform/TaskSynchronizer.h b/chromium/third_party/WebKit/Source/platform/TaskSynchronizer.h
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+/*
+ * Copyright (C) 2007, 2008, 2013 Apple 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 Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 TaskSynchronizer_h
+#define TaskSynchronizer_h
+
+#include "platform/PlatformExport.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/Threading.h"
+#include "wtf/ThreadingPrimitives.h"
+
+namespace WebCore {
+
+// TaskSynchronizer can be used to wait for task completion.
+class PLATFORM_EXPORT TaskSynchronizer {
+    WTF_MAKE_NONCOPYABLE(TaskSynchronizer);
+public:
+    TaskSynchronizer();
+
+    // Called from a thread that waits for the task completion.
+    void waitForTaskCompletion();
+
+    // Called from a thread that executes the task.
+    void taskCompleted();
+
+#ifndef NDEBUG
+    bool hasCheckedForTermination() const { return m_hasCheckedForTermination; }
+    void setHasCheckedForTermination() { m_hasCheckedForTermination = true; }
+#endif
+
+private:
+    void waitForTaskCompletionInternal();
+
+    bool m_taskCompleted;
+    Mutex m_synchronousMutex;
+    ThreadCondition m_synchronousCondition;
+#ifndef NDEBUG
+    bool m_hasCheckedForTermination;
+#endif
+};
+
+} // namespace WebCore
+
+#endif // TaskSynchronizer_h