Store non-fast scrollable regions on ScrollNode

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 234ad1d3b3f19498d928522a9cc8c5e915e2ca6b..8e2ce524780ac317aceb8b6a893939b2ffb4a6ac 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -2496,7 +2496,7 @@ InputHandler::ScrollStatus LayerTreeHostImpl::TryScroll(
     return scroll_status;
   }
 
-  if (scroll_node->contains_non_fast_scrollable_region) {
+  if (!scroll_node->non_fast_scrollable_region.IsEmpty()) {
     bool clipped = false;
     gfx::Transform inverse_screen_space_transform(
         gfx::Transform::kSkipInitialization);
@@ -2509,10 +2509,8 @@ InputHandler::ScrollStatus LayerTreeHostImpl::TryScroll(
     gfx::PointF hit_test_point_in_layer_space = MathUtil::ProjectPoint(
         inverse_screen_space_transform, screen_space_point, &clipped);
     if (!clipped &&
-        active_tree()
-            ->LayerById(scroll_node->owning_layer_id)
-            ->non_fast_scrollable_region()
-            .Contains(gfx::ToRoundedPoint(hit_test_point_in_layer_space))) {
+        scroll_node->non_fast_scrollable_region.Contains(
+            gfx::ToRoundedPoint(hit_test_point_in_layer_space))) {
       TRACE_EVENT0("cc",
                    "LayerImpl::tryScroll: Failed NonFastScrollableRegion");
       scroll_status.thread = InputHandler::SCROLL_ON_MAIN_THREAD;