cc: Move SyncedScrollOffset to scroll tree

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 102d39211418a484b5bb2b410fe87942e3abf28a..5de095862ee2347b9a15cd55b44b40bbd9dfeafe 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -495,6 +495,10 @@ void LayerTreeHost::FinishCommitOnImplThread(LayerTreeHostImpl* host_impl) {
   // 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);
   property_trees_.transform_tree.ResetChangeTracking();
   // We don't track changes to effect tree on main thread. But, to preserve any