Bug 1372061 - Add node flag recording whether we might have anonymous children. r=bholley

MozReview-Commit-ID: CMaxJ1JnuYJ

--HG--
extra : rebase_source : ac5651b0d42125fd2a4ff3f5ce03f7a6c6ab1fbb

dom/base/Element.cpp

@@ -1566,6 +1566,9 @@ Element::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
     if (aParent->HasFlag(NODE_CHROME_ONLY_ACCESS)) {
       SetFlags(NODE_CHROME_ONLY_ACCESS);
     }
+    if (HasFlag(NODE_IS_ANONYMOUS_ROOT)) {
+      aParent->SetMayHaveAnonymousChildren();
+    }
     if (aParent->IsInShadowTree()) {
       ClearSubtreeRootPointer();
       SetFlags(NODE_IS_IN_SHADOW_TREE);

dom/base/nsGenericDOMDataNode.cpp

@@ -496,6 +496,9 @@ nsGenericDOMDataNode::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
     if (aParent->HasFlag(NODE_CHROME_ONLY_ACCESS)) {
       SetFlags(NODE_CHROME_ONLY_ACCESS);
     }
+    if (HasFlag(NODE_IS_ANONYMOUS_ROOT)) {
+      aParent->SetMayHaveAnonymousChildren();
+    }
     if (aParent->IsInShadowTree()) {
       ClearSubtreeRootPointer();
       SetFlags(NODE_IS_IN_SHADOW_TREE);

dom/base/nsINode.h

@@ -1561,6 +1561,9 @@ private:
     ParserHasNotified,
     // Sets if the node is apz aware or we have apz aware listeners.
     MayBeApzAware,
+    // Set if the element might have any kind of anonymous content children,
+    // which would not be found through the element's children list.
+    ElementMayHaveAnonymousChildren,
     // Guard value
     BooleanFlagCount
   };
@@ -1699,6 +1702,10 @@ public:
   {
     return GetBoolFlag(MayBeApzAware);
   }
+
+  void SetMayHaveAnonymousChildren() { SetBoolFlag(ElementMayHaveAnonymousChildren); }
+  bool MayHaveAnonymousChildren() const { return GetBoolFlag(ElementMayHaveAnonymousChildren); }
+
 protected:
   void SetParentIsContent(bool aValue) { SetBoolFlag(ParentIsContent, aValue); }
   void SetIsInDocument() { SetBoolFlag(IsInDocument); }

dom/xbl/nsXBLBinding.cpp

@@ -215,6 +215,7 @@ nsXBLBinding::InstallAnonymousContent(nsIContent* aAnonParent, nsIContent* aElem
       child->SetFlags(NODE_CHROME_ONLY_ACCESS |
                       NODE_IS_ROOT_OF_CHROME_ONLY_ACCESS);
     }
+    child->SetFlags(NODE_IS_ANONYMOUS_ROOT);
     nsresult rv =
       child->BindToTree(doc, aElement, mBoundElement, allowScripts);
     if (NS_FAILED(rv)) {
@@ -224,8 +225,6 @@ nsXBLBinding::InstallAnonymousContent(nsIContent* aAnonParent, nsIContent* aElem
       return;
     }
 
-    child->SetFlags(NODE_IS_ANONYMOUS_ROOT);
-
 #ifdef MOZ_XUL
     // To make XUL templates work (and other goodies that happen when
     // an element is added to a XUL document), we need to notify the