Set owning layer id on transform nodes in SPv2.

third_party/WebKit/Source/platform/graphics/compositing/PropertyTreeManager.cpp

Index: third_party/WebKit/Source/platform/graphics/compositing/PropertyTreeManager.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/compositing/PropertyTreeManager.cpp b/third_party/WebKit/Source/platform/graphics/compositing/PropertyTreeManager.cpp
index 370a641608869b40252b6a99ceecf40e1cdf5672..1f40370505e30db7d5df3fc0d1c5396d94e8a7f3 100644
--- a/third_party/WebKit/Source/platform/graphics/compositing/PropertyTreeManager.cpp
+++ b/third_party/WebKit/Source/platform/graphics/compositing/PropertyTreeManager.cpp
@@ -74,6 +74,9 @@ void PropertyTreeManager::setupRootTransformNode() {
       transformTree.Insert(cc::TransformNode(), kRealRootNodeId));
   DCHECK_EQ(transformNode.id, kSecondaryRootNodeId);
   transformNode.source_node_id = transformNode.parent_id;
+  transformNode.owning_layer_id = m_rootLayer->id();

[chrishtr, 2017/04/06 18:15:21]

Please add a comment here and in the other instance that this is temporary,
and make sure there is a bug tracking the final solution.

[wkorman, 2017/04/06 18:48:26]

Done. Note we were already setting owning_layer_id in scroll, clip, and effect
nodes. Some of those are probably not animation specific, and removal could
require other work. I am only adding comment to the two transform node refs here
for now.

+  transformTree.SetOwningLayerIdForNode(&transformNode,
+                                        transformNode.owning_layer_id);
 
   // TODO(jaydasika): We shouldn't set ToScreen and FromScreen of root
   // transform node here. They should be set while updating transform tree in
@@ -163,6 +166,9 @@ int PropertyTreeManager::ensureCompositorTransformNode(
 
   cc::TransformNode& compositorNode = *transformTree().Node(id);
   compositorNode.source_node_id = parentId;
+  compositorNode.owning_layer_id = dummyLayer->id();
+  transformTree().SetOwningLayerIdForNode(&compositorNode,
+                                          compositorNode.owning_layer_id);
 
   FloatPoint3D origin = transformNode->origin();
   compositorNode.pre_local.matrix().setTranslate(-origin.x(), -origin.y(),