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

Source/core/page/PageAnimator.cpp

Index: Source/core/page/PageAnimator.cpp
diff --git a/Source/core/page/PageAnimator.cpp b/Source/core/page/PageAnimator.cpp
index 75bd21ca63aeef3957d2ffc7f1ae423e42aba6c1..07cf8556a28dc169d7be108d6ea5367ad483d047 100644
--- a/Source/core/page/PageAnimator.cpp
+++ b/Source/core/page/PageAnimator.cpp
@@ -12,6 +12,7 @@
 #include "core/page/ChromeClient.h"
 #include "core/page/Page.h"
 #include "core/svg/SVGDocumentExtensions.h"
+#include "public/platform/WebFrameTime.h"
 
 namespace WebCore {
 
@@ -23,7 +24,7 @@ PageAnimator::PageAnimator(Page* page)
 {
 }
 
-void PageAnimator::serviceScriptedAnimations(double monotonicAnimationStartTime)
+void PageAnimator::serviceScriptedAnimations(blink::WebFrameTime frameTime)
 {
     m_animationFramePending = false;
     TemporaryChange<bool> servicing(m_servicingAnimations, true);
@@ -33,8 +34,8 @@ void PageAnimator::serviceScriptedAnimations(double monotonicAnimationStartTime)
             RefPtr<LocalFrame> localFrame = toLocalFrame(frame.get());
             localFrame->view()->serviceScrollAnimations();
 
-            DocumentAnimations::updateAnimationTimingForAnimationFrame(*localFrame->document(), monotonicAnimationStartTime);
-            SVGDocumentExtensions::serviceOnAnimationFrame(*localFrame->document(), monotonicAnimationStartTime);
+            DocumentAnimations::updateAnimationTimingForAnimationFrame(*localFrame->document(), frameTime);
+            SVGDocumentExtensions::serviceOnAnimationFrame(*localFrame->document(), frameTime);
         }
     }
 
@@ -45,7 +46,7 @@ void PageAnimator::serviceScriptedAnimations(double monotonicAnimationStartTime)
     }
 
     for (size_t i = 0; i < documents.size(); ++i)
-        documents[i]->serviceScriptedAnimations(monotonicAnimationStartTime);
+        documents[i]->serviceScriptedAnimations(frameTime);
 }
 
 void PageAnimator::scheduleVisualUpdate()