Communicate MT changes to impl-only scroll offset animations

third_party/WebKit/Source/core/layout/ScrollAnchor.cpp

Index: third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
diff --git a/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp b/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
index 85fa551dd7ba7c73289aede917ec61ca80f87c2d..acf34f2ce58535de543d32b931663fefcd97a96c 100644
--- a/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
+++ b/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
@@ -206,6 +206,7 @@ void ScrollAnchor::restore()
         ScrollAnimatorBase* animator = m_scroller->existingScrollAnimator();
         if (!animator || !animator->hasRunningAnimation()) {
             m_scroller->setScrollPosition(desiredPos, AnchoringScroll);
+            animator->updateImplOnlyScrollOffsetAnimation(FloatSize(adjustment));
         } else {
             // If in the middle of a scroll animation, stop the animation, make
             // the adjustment, and continue the animation on the pending delta.