Introduce isHTMLHtmlElement and toHTMLHtmlElement

Source/core/html/parser/HTMLElementStack.cpp

Index: Source/core/html/parser/HTMLElementStack.cpp
diff --git a/Source/core/html/parser/HTMLElementStack.cpp b/Source/core/html/parser/HTMLElementStack.cpp
index 1c2e2fa4091c846b82202755ae0203f879837d3c..8953dbd5b1f3347f06ff77a261292309c15f9ce4 100644
--- a/Source/core/html/parser/HTMLElementStack.cpp
+++ b/Source/core/html/parser/HTMLElementStack.cpp
@@ -31,6 +31,7 @@
 #include "MathMLNames.h"
 #include "SVGNames.h"
 #include "core/dom/Element.h"
+#include "core/html/HTMLHtmlElement.h"
 #include "core/html/HTMLOptGroupElement.h"
 #include "core/html/HTMLTableElement.h"
 #include <wtf/PassOwnPtr.h>
@@ -45,7 +46,7 @@ namespace {
 inline bool isRootNode(HTMLStackItem* item)
 {
     return item->isDocumentFragmentNode()
-        || item->hasTagName(htmlTag);
+        || isHTMLHtmlElement(item->node());
 }
 
 inline bool isScopeMarker(HTMLStackItem* item)
@@ -309,7 +310,7 @@ void HTMLElementStack::pushRootNode(PassRefPtr<HTMLStackItem> rootItem)
 
 void HTMLElementStack::pushHTMLHtmlElement(PassRefPtr<HTMLStackItem> item)
 {
-    ASSERT(item->hasTagName(HTMLNames::htmlTag));
+    ASSERT(isHTMLHtmlElement(item->node()));
     pushRootNodeCommon(item);
 }
     
@@ -339,7 +340,7 @@ void HTMLElementStack::pushHTMLBodyElement(PassRefPtr<HTMLStackItem> item)
 
 void HTMLElementStack::push(PassRefPtr<HTMLStackItem> item)
 {
-    ASSERT(!item->hasTagName(HTMLNames::htmlTag));
+    ASSERT(!isHTMLHtmlElement(item->node()));
     ASSERT(!item->hasTagName(HTMLNames::headTag));
     ASSERT(!item->hasTagName(HTMLNames::bodyTag));
     ASSERT(m_rootNode);
@@ -351,7 +352,7 @@ void HTMLElementStack::insertAbove(PassRefPtr<HTMLStackItem> item, ElementRecord
     ASSERT(item);
     ASSERT(recordBelow);
     ASSERT(m_top);
-    ASSERT(!item->hasTagName(HTMLNames::htmlTag));
+    ASSERT(!isHTMLHtmlElement(item->node()));
     ASSERT(!item->hasTagName(HTMLNames::headTag));
     ASSERT(!item->hasTagName(HTMLNames::bodyTag));
     ASSERT(m_rootNode);
@@ -566,7 +567,7 @@ void HTMLElementStack::pushCommon(PassRefPtr<HTMLStackItem> item)
 
 void HTMLElementStack::popCommon()
 {
-    ASSERT(!topStackItem()->hasTagName(HTMLNames::htmlTag));
+    ASSERT(!isHTMLHtmlElement(topStackItem()->node()));
     ASSERT(!topStackItem()->hasTagName(HTMLNames::headTag) || !m_headElement);
     ASSERT(!topStackItem()->hasTagName(HTMLNames::bodyTag) || !m_bodyElement);
     top()->finishParsingChildren();
@@ -577,7 +578,7 @@ void HTMLElementStack::popCommon()
 
 void HTMLElementStack::removeNonTopCommon(Element* element)
 {
-    ASSERT(!element->hasTagName(HTMLNames::htmlTag));
+    ASSERT(!isHTMLHtmlElement(element));
     ASSERT(!element->hasTagName(HTMLNames::bodyTag));
     ASSERT(top() != element);
     for (ElementRecord* pos = m_top.get(); pos; pos = pos->next()) {