Support 'extend-to-zoom' viewport descriptor value

Source/core/css/CSSParser-in.cpp

Index: Source/core/css/CSSParser-in.cpp
diff --git a/Source/core/css/CSSParser-in.cpp b/Source/core/css/CSSParser-in.cpp
index 70e52b4e6cee77bfab2cd116094c4a1d0c4db770..f384f411e8d719c5e45a791a258cb6471911f3a3 100644
--- a/Source/core/css/CSSParser-in.cpp
+++ b/Source/core/css/CSSParser-in.cpp
@@ -11406,9 +11406,6 @@ unsigned CSSParser::safeUserStringTokenOffset()
 
 StyleRuleBase* CSSParser::createViewportRule()
 {
-    if (!RuntimeEnabledFeatures::cssViewportEnabled())
-        return 0;
-
     m_allowImportRules = m_allowNamespaceDeclarations = false;
 
     RefPtr<StyleRuleViewport> rule = StyleRuleViewport::create();
@@ -11425,8 +11422,6 @@ StyleRuleBase* CSSParser::createViewportRule()
 
 bool CSSParser::parseViewportProperty(CSSPropertyID propId, bool important)
 {
-    ASSERT(RuntimeEnabledFeatures::cssViewportEnabled());
-
     CSSParserValue* value = m_valueList->current();
     if (!value)
         return false;
@@ -11435,11 +11430,11 @@ bool CSSParser::parseViewportProperty(CSSPropertyID propId, bool important)
     bool validPrimitive = false;
 
     switch (propId) {
-    case CSSPropertyMinWidth: // auto | <length> | <percentage>
+    case CSSPropertyMinWidth: // auto | extend-to-zoom | <length> | <percentage>
     case CSSPropertyMaxWidth:
     case CSSPropertyMinHeight:
     case CSSPropertyMaxHeight:
-        if (id == CSSValueAuto)
+        if (id == CSSValueAuto || id == CSSValueExtendToZoom)

[kenneth.r.christiansen, 2013/07/17 16:44:30]

We need this to be an internal value. What you can only add in user sheets/UA's
etc need to be prefixed with -internal-. Yes, I didnt do that in my patch, but
Rune pointed it out

             validPrimitive = true;
         else
             validPrimitive = (!id && validUnit(value, FLength | FPercent | FNonNeg));
@@ -11485,7 +11480,6 @@ bool CSSParser::parseViewportProperty(CSSPropertyID propId, bool important)
 
 bool CSSParser::parseViewportShorthand(CSSPropertyID propId, CSSPropertyID first, CSSPropertyID second, bool important)
 {
-    ASSERT(RuntimeEnabledFeatures::cssViewportEnabled());
     unsigned numValues = m_valueList->size();
 
     if (numValues > 2)