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

Source/core/animation/AnimationTest.cpp

Index: Source/core/animation/AnimationTest.cpp
diff --git a/Source/core/animation/AnimationTest.cpp b/Source/core/animation/AnimationTest.cpp
index c4a3e7607ff1bbc51c3608ee51936c756c2e49b4..ece7819c606dd2ad8be95707d81eb203a4362cd6 100644
--- a/Source/core/animation/AnimationTest.cpp
+++ b/Source/core/animation/AnimationTest.cpp
@@ -25,7 +25,8 @@ protected:
         : document(Document::create())
         , element(document->createElement("foo", ASSERT_NO_EXCEPTION))
     {
-        document->animationClock().resetTimeForTesting();
+        document->animationClock().clearTimeForTesting();
+        document->animationClock().updateTime(blink::WebFrameTime(-1, -1, 0, 0));
         EXPECT_EQ(0, document->timeline().currentTime());
     }