Take MT jank into account when animating the scroll offset on CC

cc/animation/animation_host.cc

Index: cc/animation/animation_host.cc
diff --git a/cc/animation/animation_host.cc b/cc/animation/animation_host.cc
index f03ae70a2d989a99ed30b9d67da7e27c0ea04e05..7004db0cf6b2c4d4df40302621917c45acd3a355 100644
--- a/cc/animation/animation_host.cc
+++ b/cc/animation/animation_host.cc
@@ -503,6 +503,14 @@ bool AnimationHost::ImplOnlyScrollAnimationUpdateTarget(
       element_id, scroll_delta, max_scroll_offset, frame_monotonic_time);
 }
 
+void AnimationHost::ImplOnlyScrollAnimationAdjustDuration(
+    ElementId element_id,
+    base::TimeDelta adjustment) {
+  DCHECK(scroll_offset_animations_impl_);
+  scroll_offset_animations_impl_->ScrollAnimationAdjustDuration(element_id,
+                                                                adjustment);
+}
+
 ScrollOffsetAnimations& AnimationHost::scroll_offset_animations() const {
   DCHECK(scroll_offset_animations_);
   return *scroll_offset_animations_.get();