Guard Element and getComputedStyle methods that force a layout with inActiveDocument.

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 3ae652d4a77fd109b1f91e9e93388b5ee049fd44..d08344a7a4a6e2f46ee8d576a101558cb6d6017b 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -1940,6 +1940,14 @@ void Document::updateLayoutTreeForNode(Node* node)
     updateLayoutTree();
 }
 
+void Document::updateLayoutIgnorePendingStylesheetsForNode(Node* node)
+{
+    ASSERT(node);
+    if (!node->inActiveDocument())
+        return;
+    updateLayoutIgnorePendingStylesheets();
+}
+
 void Document::updateLayout()
 {
     ASSERT(isMainThread());