Translate viewport related meta tags into @viewport descriptors as suggested by the CSS Device Adap…

Source/core/css/CSSParser-in.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 2820 matching lines @@
     case CSSPropertyWebkitUserSelect:
     case CSSPropertyWebkitWrapFlow:
     case CSSPropertyWebkitWrapThrough:
     case CSSPropertyWebkitWritingMode:
     case CSSPropertyWhiteSpace:
     case CSSPropertyWordBreak:
     case CSSPropertyWordWrap:
         // These properties should be handled before in isValidKeywordPropertyAndValue().
         ASSERT_NOT_REACHED();
         return false;
-    // Properties bellow are validated inside parseViewportProperty, because we
+    // Properties below are validated inside parseViewportProperty, because we
     // check for parser state inViewportScope. We need to invalidate if someone
     // adds them outside a @viewport rule.
     case CSSPropertyMaxZoom:
     case CSSPropertyMinZoom:
     case CSSPropertyOrientation:
     case CSSPropertyUserZoom:
+    case CSSPropertyInternalPriority:
         validPrimitive = false;
         break;
     default:
         return parseSVGValue(propId, important);
     }
 
     if (validPrimitive) {
         parsedValue = parseValidPrimitive(id, value);
         m_valueList->next();
     }
@@ skipping 8541 matching lines @@
         m_sourceDataHandler->startEndUnknownRule();
 }
 
 unsigned CSSParser::safeUserStringTokenOffset()
 {
     return min(tokenStartOffset(), static_cast<unsigned>(m_length - 1 - m_parsedTextSuffixLength)) - m_parsedTextPrefixLength;
 }
 
 StyleRuleBase* CSSParser::createViewportRule()
 {
-    if (!RuntimeEnabledFeatures::cssViewportEnabled())
-        return 0;
-
     m_allowImportRules = m_allowNamespaceDeclarations = false;
 
     RefPtr<StyleRuleViewport> rule = StyleRuleViewport::create();
 
     rule->setProperties(createStylePropertySet());
     clearProperties();
 
     StyleRuleViewport* result = rule.get();
     m_parsedRules.append(rule.release());
     endRuleBody();
 
     return result;
 }
 
 bool CSSParser::parseViewportProperty(CSSPropertyID propId, bool important)
 {
-    ASSERT(RuntimeEnabledFeatures::cssViewportEnabled());
-
     CSSParserValue* value = m_valueList->current();
     if (!value)
         return false;
 
     CSSValueID id = value->id;
     bool validPrimitive = false;
 
     switch (propId) {
-    case CSSPropertyMinWidth: // auto | <length> | <percentage>
-    case CSSPropertyMaxWidth:
+    case CSSPropertyInternalPriority:
+        if (id == CSSValueAuto)
+            validPrimitive = true;
+        else
+            validPrimitive = (!id && validUnit(value, FNumber | FNonNeg));
+        break;
+    case CSSPropertyMinWidth: // auto | extend-to-zoom | <length> | <percentage>
+        if (id == CSSValueExtendToZoom) {
+            validPrimitive = true;
+            break;
+        }
+    case CSSPropertyMaxWidth: // auto | <length> | <percentage>
     case CSSPropertyMinHeight:
     case CSSPropertyMaxHeight:
         if (id == CSSValueAuto)
             validPrimitive = true;
         else
             validPrimitive = (!id && validUnit(value, FLength | FPercent | FNonNeg));
         break;
     case CSSPropertyWidth: // shorthand
         return parseViewportShorthand(propId, CSSPropertyMinWidth, CSSPropertyMaxWidth, important);
     case CSSPropertyHeight:
@@ skipping 28 matching lines @@
             addProperty(propId, parsedValue.release(), important);
             return true;
         }
     }
 
     return false;
 }
 
 bool CSSParser::parseViewportShorthand(CSSPropertyID propId, CSSPropertyID first, CSSPropertyID second, bool important)
 {
-    ASSERT(RuntimeEnabledFeatures::cssViewportEnabled());
     unsigned numValues = m_valueList->size();
 
     if (numValues > 2)
         return false;
 
     ShorthandScope scope(this, propId);
 
     if (!parseViewportProperty(first, important))
         return false;
 
@@ skipping 244 matching lines @@
 {
     // The tokenizer checks for the construct of an+b.
     // However, since the {ident} rule precedes the {nth} rule, some of those
     // tokens are identified as string literal. Furthermore we need to accept
     // "odd" and "even" which does not match to an+b.
     return equalIgnoringCase(token, "odd") || equalIgnoringCase(token, "even")
         || equalIgnoringCase(token, "n") || equalIgnoringCase(token, "-n");
 }
 
 }