Initial import attempt, just to play with. Many things disabled/removed

ui/cc/cc/CCCompletionEvent.h

Index: ui/cc/cc/CCCompletionEvent.h
diff --git a/ui/cc/cc/CCCompletionEvent.h b/ui/cc/cc/CCCompletionEvent.h
new file mode 100644
index 0000000000000000000000000000000000000000..f0226617bed533d7e8d85331dc2690ab6bfd5d2e
--- /dev/null
+++ b/ui/cc/cc/CCCompletionEvent.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2011 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 CCCompletionEvent_h
+#define CCCompletionEvent_h
+
+#include <wtf/ThreadingPrimitives.h>
+
+namespace WebCore {
+
+// Used for making blocking calls from one thread to another. Use only when
+// absolutely certain that doing-so will not lead to a deadlock.
+//
+// It is safe to destroy this object as soon as wait() returns.
+class CCCompletionEvent {
+public:
+    CCCompletionEvent()
+    {
+#ifndef NDEBUG
+        m_waited = false;
+        m_signaled = false;
+#endif
+        m_mutex.lock();
+    }
+
+    ~CCCompletionEvent()
+    {
+        m_mutex.unlock();
+        ASSERT(m_waited);
+        ASSERT(m_signaled);
+    }
+
+    void wait()
+    {
+        ASSERT(!m_waited);
+#ifndef NDEBUG
+        m_waited = true;
+#endif
+        m_condition.wait(m_mutex);
+    }
+
+    void signal()
+    {
+        MutexLocker lock(m_mutex);
+        ASSERT(!m_signaled);
+#ifndef NDEBUG
+        m_signaled = true;
+#endif
+        m_condition.signal();
+    }
+
+private:
+    Mutex m_mutex;
+    ThreadCondition m_condition;
+#ifndef NDEBUG
+    // Used to assert that wait() and signal() are each called exactly once.
+    bool m_waited;
+    bool m_signaled;
+#endif
+};
+
+}
+
+#endif