Web Animations: Use a single animation clock

third_party/WebKit/Source/core/page/PageAnimator.cpp

Index: third_party/WebKit/Source/core/page/PageAnimator.cpp
diff --git a/third_party/WebKit/Source/core/page/PageAnimator.cpp b/third_party/WebKit/Source/core/page/PageAnimator.cpp
index 03c746d49b4abbedd4049413e4739e492fcfe58d..d0b8591a17c1da4d1ddfc5fb1eb13ec96f381067 100644
--- a/third_party/WebKit/Source/core/page/PageAnimator.cpp
+++ b/third_party/WebKit/Source/core/page/PageAnimator.cpp
@@ -36,6 +36,7 @@ void PageAnimator::serviceScriptedAnimations(double monotonicAnimationStartTime)
 {
     RefPtrWillBeRawPtr<PageAnimator> protector(this);
     TemporaryChange<bool> servicing(m_servicingAnimations, true);
+    clock().updateTime(monotonicAnimationStartTime);
 
     WillBeHeapVector<RefPtrWillBeMember<Document>> documents;
     for (Frame* frame = m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
@@ -44,7 +45,7 @@ void PageAnimator::serviceScriptedAnimations(double monotonicAnimationStartTime)
     }
 
     for (auto& document : documents) {
-        DocumentAnimations::updateAnimationTimingForAnimationFrame(*document, monotonicAnimationStartTime);
+        DocumentAnimations::updateAnimationTimingForAnimationFrame(*document);
         if (document->view()) {
             if (document->view()->shouldThrottleRendering())
                 continue;