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..5a77132bed2754ce3cbe42807b3f4c01769d7567 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 +41,24 @@ 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(blink::WebFrameTime::CreateNull())

[eseidel, 2014/07/07 19:31:16]

Blink API is in Blink style, so CreateNull() is wrong.

[mithro-old, 2014/07/08 04:28:30]

I had a quick re-read of the Blink Coding Style to see if there was any clear
direction there but wasn't able to see anything?

I was thinking of using a static constant on the WebFrameTime class to track an
Undefined value, the couple of APIs in public/platform which have things like
this are;

public/platform/WebCryptoAlgorithm.h
90:    static const ParamsTypeOrUndefined Undefined = -1;
public/platform/WebURLLoaderClient.h
74:    static const int64_t kUnknownEncodedDataLength = -1;
public/platform/Platform.h
305:    static const size_t noDecodedImageByteLimit = static_cast<size_t>(-1);

I thought following the Undefined pattern in
public/platform/WebCryptoAlgorithm.h might be the way to go but annoyingly you
can't have a "static const double Undefined = -1;" before C++0x. I've tried to
do the same with a static function.

How does that look?

         , 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();
+
 private:
-    WTF::TimeFunction m_monotonicallyIncreasingTime;
-    double m_time;
+    double internalCurrentTime();
+
+    blink::WebFrameTime m_frameTime;
     unsigned m_currentTask;
     static unsigned s_currentTask;
 };