Web Animations: Extract an API for servicing animations

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index e5dc0640fc93da5f00fe0e7ffc6a536c53e64d94..fa56877a5027c55cb0f1043b592dd7baedc16337 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -30,6 +30,7 @@
 #include "HTMLNames.h"
 #include "RuntimeEnabledFeatures.h"
 #include "core/accessibility/AXObjectCache.h"
+#include "core/animation/DocumentAnimations.h"
 #include "core/css/FontFaceSet.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/DocumentMarkerController.h"
@@ -2050,13 +2051,7 @@ void FrameView::serviceScriptedAnimations(double monotonicAnimationStartTime)
         if (!RuntimeEnabledFeatures::webAnimationsCSSEnabled())
             frame->animation().serviceAnimations();
 
-        // FIXME: Animation events for newly started CSS Animations should be fired
-        // asynchronously after the style recalc that triggered them. For now we fire
-        // them here (a frame late) so that they at least apply against the correct
-        // animation state.
-        frame->document()->dispatchAnimationEvents();
-        frame->document()->serviceAnimations(monotonicAnimationStartTime);
-        frame->document()->dispatchAnimationEvents();
+        DocumentAnimations::serviceOnAnimationFrame(*frame->document(), monotonicAnimationStartTime);
     }
 
     Vector<RefPtr<Document> > documents;