Fix assignedNodes({flatten:true}) to return fallback content in document tree

third_party/WebKit/Source/core/html/HTMLSlotElement.h

Index: third_party/WebKit/Source/core/html/HTMLSlotElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLSlotElement.h b/third_party/WebKit/Source/core/html/HTMLSlotElement.h
index eef9450d3a7a3964fe545898ae2c6dd775da18ae..ca81540c5af6699c1cbb12100b1b86a51172a798 100644
--- a/third_party/WebKit/Source/core/html/HTMLSlotElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLSlotElement.h
@@ -107,6 +107,8 @@ class CORE_EXPORT HTMLSlotElement final : public HTMLElement {
   void RemovedFrom(ContainerNode*) final;
   void WillRecalcStyle(StyleRecalcChange) final;
 
+  const HeapVector<Member<Node>> GetDistributedNodesOfSlotInDocument() const;

[hayato, 2017/05/12 03:19:09]

InDocument is not correct. It should be inNonShadowTrees or something.

I would rather name this to more logical name, than leaking the condition.
e.g. SupportDistribution() is a logical name, and it doesn't leak the internal
condition.

+
   void EnqueueSlotChangeEvent();
 
   HeapVector<Member<Node>> assigned_nodes_;