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

cc/animation/scroll_offset_animation_curve.h

Index: cc/animation/scroll_offset_animation_curve.h
diff --git a/cc/animation/scroll_offset_animation_curve.h b/cc/animation/scroll_offset_animation_curve.h
index 7f9ea55c53ebc2a033382d3fcb0805ad77fee717..175b4af476b3a233fb69f4e03794c11723618e6e 100644
--- a/cc/animation/scroll_offset_animation_curve.h
+++ b/cc/animation/scroll_offset_animation_curve.h
@@ -25,9 +25,14 @@ class CC_EXPORT ScrollOffsetAnimationCurve : public AnimationCurve {
       std::unique_ptr<TimingFunction> timing_function,
       DurationBehavior = DurationBehavior::DELTA_BASED);
 
+  static base::TimeDelta SegmentDuration(const gfx::Vector2dF& delta,
+                                         DurationBehavior behavior,
+                                         base::TimeDelta delayed_by);
+
   ~ScrollOffsetAnimationCurve() override;
 
-  void SetInitialValue(const gfx::ScrollOffset& initial_value);
+  void SetInitialValue(const gfx::ScrollOffset& initial_value,
+                       base::TimeDelta delayed_by = base::TimeDelta());
   bool HasSetInitialValue() const;
   gfx::ScrollOffset GetValue(base::TimeDelta t) const;
   gfx::ScrollOffset target_value() const { return target_value_; }