CL for perf tryjob on win

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 56afe214d957c65ababa6f2a5a42eb885f51b9e1..b157a9ff63308a560064533c91ecefa16c231cfb 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -702,8 +702,11 @@ PassRefPtrWillBeRawPtr<Element> Document::createElement(const AtomicString& name
         return nullptr;
     }
 
-    if (isXHTMLDocument() || isHTMLDocument())
-        return HTMLElementFactory::createHTMLElement(convertLocalName(name), *this, 0, false);
+    if (isXHTMLDocument() || isHTMLDocument()) {
+        auto el = HTMLElementFactory::createHTMLElement(convertLocalName(name), *this, 0, false);
+        el->taintElementIfFromIsolatedWorld();
+        return el;
+    }
 
     return Element::create(QualifiedName(nullAtom, name, nullAtom), this);
 }
@@ -752,7 +755,9 @@ PassRefPtrWillBeRawPtr<Element> Document::createElementNS(const AtomicString& na
     if (qName == QualifiedName::null())
         return nullptr;
 
-    return createElement(qName, false);
+    auto el = createElement(qName, false);
+    el->taintElementIfFromIsolatedWorld();
+    return el;
 }
 
 PassRefPtrWillBeRawPtr<Element> Document::createElementNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, const AtomicString& typeExtension, ExceptionState& exceptionState)