Allow grid positions to be named grid areas

Source/core/css/resolver/StyleBuilderCustom.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
@@ skipping 927 matching lines @@
     }
 
     // The parser should have rejected any <track-list> without any <track-size> as
     // this is not conformant to the syntax.
     ASSERT(!trackSizes.isEmpty());
     return true;
 }
 
 static bool createGridPosition(CSSValue* value, GridPosition& position)
 {
-    // For now, we only accept: 'auto' | [ <integer> || <string> ] | span && <integer>?
+    // We accept the specification's grammar:
+    // 'auto' | [ <integer> || <string> ] | [ span && [ <integer> || string ] ] | <ident>
 
     if (value->isPrimitiveValue()) {
         CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
+        // We translate <ident> to <string> during parsing as it
+        // makes handling it more simple.
+        if (primitiveValue->isString()) {
+            position.setNamedGridArea(primitiveValue->getStringValue());
+            return true;
+        }
+
         ASSERT(primitiveValue->getValueID() == CSSValueAuto);
         return true;
     }
 
     CSSValueList* values = toCSSValueList(value);
     ASSERT(values->length());
 
     bool isSpanPosition = false;
     // The specification makes the <integer> optional, in which case it default to '1'.
     int gridLineNumber = 1;
@@ skipping 1283 matching lines @@
         break;
     }
     case CSSPropertyEnableBackground:
         // Silently ignoring this property for now
         // http://bugs.webkit.org/show_bug.cgi?id=6022
         break;
     }
 }
 
 } // namespace WebCore