cc: Move SyncedScrollOffset to scroll tree

cc/trees/layer_tree_host.cc

 // Copyright 2011 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/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 477 matching lines @@
       TRACE_EVENT0("cc", "LayerTreeHost::AnimationHost::PushProperties");
       DCHECK(host_impl->animation_host());
       animation_host_->PushPropertiesTo(host_impl->animation_host());
     }
   }
 
   // This must happen after synchronizing property trees and after push
   // properties, which updates property tree indices.
   sync_tree->UpdatePropertyTreeScrollingAndAnimationFromMainThread();
 
+  // This must happen after synchronizing property trees and after pushing
+  // properties, which updates the clobber_active_value flag.
+  sync_tree->UpdatePropertyTreeScrollOffset(&property_trees_);
+
   micro_benchmark_controller_.ScheduleImplBenchmarks(host_impl);
   // We don't track changes to effect tree on main thread. But, to preserve any
   // change tracking done on active tree's effect tree, we copy it to the main
   // thread's effect tree before we push the main thread property trees to
   // active tree.
   if (property_trees_changed_on_active_tree)
     property_trees_.ResetAllChangeTracking(
         PropertyTrees::ResetFlags::ALL_TREES);
   else
     property_trees_.ResetAllChangeTracking(
@@ skipping 1105 matching lines @@
   LayerTreeHostCommon::CallFunctionForSubtree(
       root_layer(), [seq_num](Layer* layer) {
         layer->set_property_tree_sequence_number(seq_num);
       });
 
   surface_id_namespace_ = proto.surface_id_namespace();
   next_surface_sequence_ = proto.next_surface_sequence();
 }
 
 }  // namespace cc