Experimental fix for scroll animation update bug. [DO NOT COMMIT THIS CHANGE]

cc/animation/scroll_offset_animations_impl.cc

Index: cc/animation/scroll_offset_animations_impl.cc
diff --git a/cc/animation/scroll_offset_animations_impl.cc b/cc/animation/scroll_offset_animations_impl.cc
index 71a96b429f5938cb0c9f20ff6bf95cf88d09c0f9..ccbf2dedfc5e33aaeb3f1390c94c5be74f914014 100644
--- a/cc/animation/scroll_offset_animations_impl.cc
+++ b/cc/animation/scroll_offset_animations_impl.cc
@@ -98,9 +98,11 @@ bool ScrollOffsetAnimationsImpl::ScrollAnimationUpdateTarget(
   // t = -delayed_by.
   trimmed -= delayed_by;
 
+  double old_dur = curve->Duration().InMillisecondsF();
   curve->UpdateTarget(trimmed.InSecondsF(), new_target);
+  double new_dur = curve->Duration().InMillisecondsF();
 
-  return true;
+  return old_dur != new_dur;
 }
 
 void ScrollOffsetAnimationsImpl::ScrollAnimationApplyAdjustment(