[cc] Rename all cc/ filenames to Chromium style

cc/delay_based_time_source.h

-// Copyright 2012 The Chromium Authors. All rights reserved.
+// Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
+
+#ifndef CCDelayBasedTimeSource_h
+#define CCDelayBasedTimeSource_h
+
+#include "CCTimeSource.h"
+#include "CCTimer.h"
+#include <wtf/PassRefPtr.h>
+
+namespace cc {
+
+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(base::TimeDelta interval, CCThread*);
+
+    virtual ~CCDelayBasedTimeSource();
+
+    virtual void setClient(CCTimeSourceClient* client) OVERRIDE;
+
+    // CCTimeSource implementation
+    virtual void setTimebaseAndInterval(base::TimeTicks timebase, base::TimeDelta interval) OVERRIDE;
+
+    virtual void setActive(bool) OVERRIDE;
+    virtual bool active() const OVERRIDE;
+
+    // Get the last and next tick times. nextTimeTime() returns null when
+    // inactive.
+    virtual base::TimeTicks lastTickTime() OVERRIDE;
+    virtual base::TimeTicks nextTickTime() OVERRIDE;
+
+    // CCTimerClient implementation.
+    virtual void onTimerFired() OVERRIDE;
+
+    // Virtual for testing.
+    virtual base::TimeTicks now() const;
+
+protected:
+    CCDelayBasedTimeSource(base::TimeDelta interval, CCThread*);
+    base::TimeTicks nextTickTarget(base::TimeTicks now);
+    void postNextTickTask(base::TimeTicks now);
+
+    enum State {
+        STATE_INACTIVE,
+        STATE_STARTING,
+        STATE_ACTIVE,
+    };
+
+    struct Parameters {
+        Parameters(base::TimeDelta interval, base::TimeTicks tickTarget)
+            : interval(interval), tickTarget(tickTarget)
+        { }
+        base::TimeDelta interval;
+        base::TimeTicks tickTarget;
+    };
+
+    CCTimeSourceClient* m_client;
+    bool m_hasTickTarget;
+    base::TimeTicks m_lastTickTime;
+
+    // m_currentParameters should only be written by postNextTickTask.
+    // m_nextParameters will take effect on the next call to postNextTickTask.
+    // Maintaining a pending set of parameters allows nextTickTime() to always
+    // reflect the actual time we expect onTimerFired to be called.
+    Parameters m_currentParameters;
+    Parameters m_nextParameters;
+
+    State m_state;
+    CCThread* m_thread;
+    CCTimer m_timer;
+};
+
+}
+#endif // CCDelayBasedTimeSource_h