Make the web-animations engine use the passed in blink::WebFrameTime values.

Source/core/animation/AnimationClock.h

Index: Source/core/animation/AnimationClock.h
diff --git a/Source/core/animation/AnimationClock.h b/Source/core/animation/AnimationClock.h
index b5bb0d9adc6b5e13f1351019755fac8e21661591..453efb4335138d7671d077093cc1ea39ba12b49e 100644
--- a/Source/core/animation/AnimationClock.h
+++ b/Source/core/animation/AnimationClock.h
@@ -31,7 +31,7 @@
 #ifndef AnimationClock_h
 #define AnimationClock_h
 
-#include "wtf/CurrentTime.h"
+#include "public/platform/WebFrameTime.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassOwnPtr.h"
 #include <limits>
@@ -41,22 +41,23 @@ namespace WebCore {
 class AnimationClock {
     WTF_MAKE_NONCOPYABLE(AnimationClock);
 public:
-    explicit AnimationClock(WTF::TimeFunction monotonicallyIncreasingTime = WTF::monotonicallyIncreasingTime)
-        : m_monotonicallyIncreasingTime(monotonicallyIncreasingTime)
-        , m_time(0)
+    explicit AnimationClock()
+        : m_frameTime()
         , m_currentTask(std::numeric_limits<unsigned>::max())
-    {
-    }
+    { }
 
-    void updateTime(double time);
+    void updateTime(blink::WebFrameTime);
     double currentTime();
-    void resetTimeForTesting();
-
     static void notifyTaskStart() { ++s_currentTask; }
 
+    void resetTimeForTesting();
+    void tickTimeForTesting();
+    void clearTimeForTesting();
+    static blink::WebFrameTime createTimeForTesting(double currentFrameMonotonic, double nextFrameMonotonic);
 private:
-    WTF::TimeFunction m_monotonicallyIncreasingTime;
-    double m_time;
+    double internalCurrentTime();
+
+    blink::WebFrameTime m_frameTime;
     unsigned m_currentTask;
     static unsigned s_currentTask;
 };