Support compositing for active animations in SPv2.

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

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index e1b62509b08c745affd26a7a3a85dcc10a194dd6..84f4946dba1d674fa331ca3a2a0ec308034fe441 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/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())

[wkorman, 2016/12/15 23:06:00]

Will remove before landing, this is manual patch of
https://codereview.chromium.org/2570723002

+      DocumentAnimations::updateAnimations(layoutView()->document());
+
     if (targetState == DocumentLifecycle::PaintClean) {
       if (!m_frame->document()->printing())
         synchronizedPaint();