For SPv2, move updateAnimations() to follow scrolling and paint invalidation.

BUG=666986

Review-Url: https://codereview.chromium.org/2570723002
Cr-Commit-Position: refs/heads/master@{#438971}

third_party/WebKit/Source/core/frame/FrameView.cpp

@@ -2873,8 +2873,6 @@ void FrameView::updateLifecyclePhasesInternal(
       if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
         view.compositor()->updateIfNeededRecursive();
       } else {
-        DocumentAnimations::updateAnimations(layoutView()->document());
-
         forAllNonThrottledFrameViews([](FrameView& frameView) {
           frameView.layoutView()->layer()->updateDescendantDependentFlags();
           frameView.layoutView()->commitPendingSelection();
@@ -2904,6 +2902,9 @@ void FrameView::updateLifecyclePhasesInternal(
       updatePaintProperties();
     }
 
+    if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+      DocumentAnimations::updateAnimations(layoutView()->document());
+
     if (targetState == DocumentLifecycle::PaintClean) {
       if (!m_frame->document()->printing())
         synchronizedPaint();