Convert CC scheduler logic to use base::TimeTicks/Delta instead of doubles

cc/CCTimeSource.h

 // 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 CCTimeSource_h
 #define CCTimeSource_h
 
+#include "base/time.h"
 #include <wtf/RefCounted.h>
 
 namespace cc {
 
 class CCThread;
 
 class CCTimeSourceClient {
 public:
     virtual void onTimerTick() = 0;
 
 protected:
     virtual ~CCTimeSourceClient() { }
 };
 
 // An generic interface for getting a reliably-ticking timesource of
 // a specified rate.
 //
 // Be sure to call setActive(false) before releasing your reference to the
 // timer, or it will keep on ticking!
 class CCTimeSource : public RefCounted<CCTimeSource> {
 public:
     virtual ~CCTimeSource() { }
     virtual void setClient(CCTimeSourceClient*) = 0;
     virtual void setActive(bool) = 0;
     virtual bool active() const = 0;
-    virtual void setTimebaseAndInterval(double timebase, double intervalSeconds) = 0;
-    virtual double lastTickTime() = 0;
-    virtual double nextTickTimeIfActivated() = 0;
+    virtual void setTimebaseAndInterval(base::TimeTicks timebase, base::TimeDelta interval) = 0;
+    virtual base::TimeTicks lastTickTime() = 0;
+    virtual base::TimeTicks nextTickTimeIfActivated() = 0;
 };
 
 }
 #endif // CCSmoothedTimer_h