Clarify that Blink does not support a re-distribution across v0 and v1 shadow trees

third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp

Index: third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp
diff --git a/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp b/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp
index 12632179e87871347659c0991a8d4657bd557cab..fca3fa5350e6904cfe7b4fb92341a08506f50ccc 100644
--- a/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp
+++ b/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp
@@ -40,8 +40,8 @@ void SlotAssignment::resolveAssignment(ShadowRoot& shadowRoot)
     }
 
     for (Node& child : NodeTraversal::childrenOf(*shadowRoot.host())) {
-        if (child.isElementNode() && isActiveInsertionPoint(child)) {
-            // TODO(hayato): Support re-distribution across v0 and v1 shadow trees
+        if (child.isInsertionPoint()) {

[hayato, 2016/04/11 09:34:40]

Strictly speaking, this is the behavior change. However, let me omit to write a
test for that because it is no worth having a test for that.

[kochi, 2016/04/11 10:35:33]

Acknowledged.

+            // A re-distribution across v0 and v1 shadow trees is not supported.
             detachNotAssignedNode(child);
             continue;
         }