Fix bounds clamping during composited smooth scroll.

cc/animation/scroll_offset_animation_curve.cc

Index: cc/animation/scroll_offset_animation_curve.cc
diff --git a/cc/animation/scroll_offset_animation_curve.cc b/cc/animation/scroll_offset_animation_curve.cc
index 54f6fb70d8cb80941011638d0dcc0ff0ecd3909b..04614b572c89e40df4844e7c648beff0a0130d80 100644
--- a/cc/animation/scroll_offset_animation_curve.cc
+++ b/cc/animation/scroll_offset_animation_curve.cc
@@ -182,6 +182,11 @@ static double VelocityBasedDurationBound(gfx::Vector2dF old_delta,
 void ScrollOffsetAnimationCurve::UpdateTarget(
     double t,
     const gfx::ScrollOffset& new_target) {
+  if (std::abs(MaximumDimension(target_value_.DeltaFrom(new_target))) <
+      kEpsilon) {
+    target_value_ = new_target;
+    return;
+  }
   gfx::ScrollOffset current_position =
       GetValue(base::TimeDelta::FromSecondsD(t));
   gfx::Vector2dF old_delta = target_value_.DeltaFrom(initial_value_);