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

ui/cc/cc/CCDelayBasedTimeSource.h

Index: ui/cc/cc/CCDelayBasedTimeSource.h
diff --git a/ui/cc/cc/CCDelayBasedTimeSource.h b/ui/cc/cc/CCDelayBasedTimeSource.h
new file mode 100644
index 0000000000000000000000000000000000000000..99795db81c96ccdcdaf5c02f02bc3eebb6c65fd0
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+++ b/ui/cc/cc/CCDelayBasedTimeSource.h
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+/*
+ * 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 CCDelayBasedTimeSource_h
+#define CCDelayBasedTimeSource_h
+
+#include "cc/CCTimeSource.h"
+#include "cc/CCTimer.h"
+
+#include <wtf/PassRefPtr.h>
+
+namespace WebCore {
+
+class CCThread;
+
+// This timer implements a time source that achieves the specified interval
+// in face of millisecond-precision delayed callbacks and random queueing delays.
+class CCDelayBasedTimeSource : public CCTimeSource, CCTimerClient {
+public:
+    static PassRefPtr<CCDelayBasedTimeSource> create(double intervalSeconds, CCThread*);
+
+    virtual ~CCDelayBasedTimeSource() { }
+
+    virtual void setClient(CCTimeSourceClient* client) OVERRIDE { m_client = client; }
+
+    virtual void setActive(bool) OVERRIDE;
+    virtual bool active() const OVERRIDE { return m_state != STATE_INACTIVE; }
+
+    // CCTimerClient implementation.
+    virtual void onTimerFired() OVERRIDE;
+
+    // Virtual for testing.
+    virtual double monotonicallyIncreasingTime() const;
+
+protected:
+    CCDelayBasedTimeSource(double interval, CCThread*);
+    void postNextTickTask(double now);
+
+    enum State {
+        STATE_INACTIVE,
+        STATE_STARTING,
+        STATE_ACTIVE,
+    };
+    CCTimeSourceClient* m_client;
+    bool m_hasTickTarget;
+    double m_intervalSeconds;
+    double m_tickTarget;
+    State m_state;
+    CCThread* m_thread;
+    CCTimer m_timer;
+};
+
+}
+#endif // CCDelayBasedTimeSource_h