Add sticky nodes affected by inner and outer viewport bounds deltas.

cc/trees/property_tree_builder.cc

Index: cc/trees/property_tree_builder.cc
diff --git a/cc/trees/property_tree_builder.cc b/cc/trees/property_tree_builder.cc
index 17ed191d074f8376327c66cc192f0c4267ff7e75..cf63139d8180e9d9e2879624b8b009bd715f38e2 100644
--- a/cc/trees/property_tree_builder.cc
+++ b/cc/trees/property_tree_builder.cc
@@ -705,9 +705,15 @@ bool AddTransformNodeIfNeeded(
     ScrollNode* scroll_ancestor =
         data_for_children->property_trees->scroll_tree.Node(
             sticky_data->scroll_ancestor);
-    if (scroll_ancestor->is_inner_viewport_scroll_layer) {
-      data_for_children->property_trees->transform_tree
-          .AddNodeAffectedByInnerViewportBoundsDelta(node->id);
+    if (sticky_data->constraints.is_anchored_right ||
+        sticky_data->constraints.is_anchored_bottom) {
+      if (scroll_ancestor->is_inner_viewport_scroll_layer) {
+        data_for_children->property_trees->transform_tree
+            .AddNodeAffectedByInnerViewportBoundsDelta(node->id);

[ajuma, 2016/10/28 17:10:41]

As discussed, please rename TransformNode::affected_by_.... to
TransformNode::moved_by...., since these are no longer symmetric with the the
nodes_affected_by... sets. Please also add a comment about this.

[flackr, 2016/10/28 17:24:51]

Done.

+      } else if (scroll_ancestor->is_outer_viewport_scroll_layer) {
+        data_for_children->property_trees->transform_tree
+            .AddNodeAffectedByOuterViewportBoundsDelta(node->id);
+      }
     }
     sticky_data->main_thread_offset =
         layer->position().OffsetFromOrigin() -