cc :: Move tracking of layer_property_changed to main thread (2)

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 8c8c20512c40a8aeb2aa70f68f215c99fe8c06d9..d08b7119ad286e7ec01c4ac7c91599f92142f918 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1704,6 +1704,10 @@ void LayerTreeHostImpl::DrawLayers(FrameData* frame) {
         DidDrawDamagedArea();
   }
   active_tree_->root_layer()->ResetAllChangeTrackingForSubtree();
+  active_tree_->root_layer()
+      ->layer_tree_impl()
+      ->property_trees()
+      ->transform_tree.ResetChangeTracking();
 
   active_tree_->set_has_ever_been_drawn(true);
   devtools_instrumentation::DidDrawFrame(id_);
@@ -1991,6 +1995,12 @@ void LayerTreeHostImpl::ActivateSyncTree() {
     TreeSynchronizer::PushProperties(pending_tree_->root_layer(),
                                      active_tree_->root_layer());
     pending_tree_->PushPropertiesTo(active_tree_.get());
+    if (pending_tree_->root_layer()) {
+      pending_tree_->root_layer()
+          ->layer_tree_impl()
+          ->property_trees()
+          ->transform_tree.ResetChangeTracking();
+    }
 
     // Now that we've synced everything from the pending tree to the active
     // tree, rename the pending tree the recycle tree so we can reuse it on the