Update from chromium https://crrev.com/301315

cc/layers/layer_impl.cc

 // Copyright 2012 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/layers/layer_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "base/debug/trace_event_argument.h"
 #include "base/json/json_reader.h"
 #include "base/strings/stringprintf.h"
@@ skipping 1134 matching lines @@
 
     if (scroll_offset_delegate_) {
       scroll_offset_delegate_->SetTotalScrollOffset(
           ScrollOffsetWithDelta(scroll_offset_, scroll_delta));
     } else {
       scroll_delta_ = scroll_delta;
     }
   }
 
   if (changed) {
+    if (scroll_offset_delegate_)
+      scroll_offset_delegate_->Update();
     DidScroll();
   }
 }
 
 gfx::Vector2dF LayerImpl::ScrollDelta() const {
   if (scroll_offset_delegate_) {
     return scroll_offset_delegate_->GetTotalScrollOffset().DeltaFrom(
         scroll_offset_);
   }
   return scroll_delta_;
@@ skipping 422 matching lines @@
 
 void LayerImpl::NotifyAnimationFinished(
     base::TimeTicks monotonic_time,
     Animation::TargetProperty target_property,
     int group) {
   if (target_property == Animation::ScrollOffset)
     layer_tree_impl_->InputScrollAnimationFinished();
 }
 
 }  // namespace cc