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

cc/CCLayerTreeHostImpl.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 CCLayerTreeHostImpl_h
 #define CCLayerTreeHostImpl_h
 
 #include "CCAnimationEvents.h"
 #include "CCInputHandler.h"
 #include "CCLayerSorter.h"
 #include "CCRenderPass.h"
 #include "CCRenderPassSink.h"
 #include "CCRenderer.h"
 #include "SkColor.h"
+#include "base/time.h"
 #include <public/WebCompositorOutputSurfaceClient.h>
 #include <wtf/PassOwnPtr.h>
 #include <wtf/RefPtr.h>
 
 namespace cc {
 
 class CCCompletionEvent;
 class CCDebugRectHistory;
 class CCFrameRateCounter;
 class CCHeadsUpDisplayLayerImpl;
@@ skipping 185 matching lines @@
 
     void animatePageScale(double monotonicTime);
     void animateScrollbars(double monotonicTime);
 
     // Exposed for testing.
     void calculateRenderSurfaceLayerList(CCLayerList&);
 
     // Virtual for testing.
     virtual void animateLayers(double monotonicTime, double wallClockTime);
 
-    // Virtual for testing. Measured in seconds.
-    virtual double lowFrequencyAnimationInterval() const;
+    // Virtual for testing.
+    virtual base::TimeDelta lowFrequencyAnimationInterval() const;
 
     CCLayerTreeHostImplClient* m_client;
     int m_sourceFrameNumber;
 
 private:
     void computeDoubleTapZoomDeltas(CCScrollAndScaleSet* scrollInfo);
     void computePinchZoomDeltas(CCScrollAndScaleSet* scrollInfo);
     void makeScrollAndScaleSet(CCScrollAndScaleSet* scrollInfo, const IntSize& scrollOffset, float pageScale);
 
     void setPageScaleDelta(float);
@@ skipping 58 matching lines @@
     // rendering and input event hit testing.
     CCLayerList m_renderSurfaceLayerList;
 
     OwnPtr<CCFrameRateCounter> m_fpsCounter;
     OwnPtr<CCDebugRectHistory> m_debugRectHistory;
 };
 
 };
 
 #endif