Use a new id type for tracking scrolling areas

This is a step in disassociating scrolling areas from stacking
contexts. Now scroll areas are defined by unique ids, which means that
in the future stacking context will be able to contain more than one.

1 files changed, 5 insertions, 2 deletions

diff --git a/components/layout/table_wrapper.rs b/components/layout/table_wrapper.rs
index ec029f8d06f..1fcf08b249b 100644
--- a/components/layout/table_wrapper.rs
+++ b/components/layout/table_wrapper.rs
@@ -23,6 +23,7 @@ use floats::FloatKind;
 use flow::{Flow, FlowClass, ImmutableFlowUtils, INLINE_POSITION_IS_STATIC, OpaqueFlow};
 use fragment::{Fragment, FragmentBorderBoxIterator, Overflow};
 use gfx::display_list::StackingContext;
+use gfx_traits::ScrollRootId;
 use gfx_traits::print_tree::PrintTree;
 use model::MaybeAuto;
 use std::cmp::{max, min};
@@ -468,8 +469,10 @@ impl Flow for TableWrapperFlow {
         self.block_flow.build_display_list(state);
     }
 
-    fn collect_stacking_contexts(&mut self, parent: &mut StackingContext) {
-        self.block_flow.collect_stacking_contexts(parent);
+    fn collect_stacking_contexts(&mut self,
+                                 parent: &mut StackingContext,
+                                 parent_scroll_root_id: ScrollRootId) {
+        self.block_flow.collect_stacking_contexts(parent, parent_scroll_root_id);
     }
 
     fn repair_style(&mut self, new_style: &Arc<ServoComputedValues>) {