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

cc/animation/animation_host.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/animation/animation_host.h"
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 485 matching lines @@
 bool AnimationHost::ImplOnlyScrollAnimationUpdateTarget(
     ElementId element_id,
     const gfx::Vector2dF& scroll_delta,
     const gfx::ScrollOffset& max_scroll_offset,
     base::TimeTicks frame_monotonic_time) {
   DCHECK(scroll_offset_animations_impl_);
   return scroll_offset_animations_impl_->ScrollAnimationUpdateTarget(
       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();
 }
 
 void AnimationHost::ScrollAnimationAbort(bool needs_completion) {
   DCHECK(scroll_offset_animations_impl_);
   return scroll_offset_animations_impl_->ScrollAnimationAbort(needs_completion);
 }
 
@@ skipping 32 matching lines @@
 const AnimationHost::ElementToAnimationsMap&
 AnimationHost::all_element_animations_for_testing() const {
   return element_to_animations_map_;
 }
 
 void AnimationHost::OnAnimationWaitingForDeletion() {
   animation_waiting_for_deletion_ = true;
 }
 
 }  // namespace cc