Reland of [css-align] Don't resolve 'auto' values for computed style.

third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 2936 matching lines @@
   }
   NOTREACHED();
   return kContentBox;
 }
 
 template <>
 inline CSSIdentifierValue::CSSIdentifierValue(ItemPosition item_position)
     : CSSValue(kIdentifierClass) {
   switch (item_position) {
     case kItemPositionAuto:
-      // The 'auto' values might have been already resolved.
-      NOTREACHED();
-      value_id_ = CSSValueNormal;
+      value_id_ = CSSValueAuto;
       break;
     case kItemPositionNormal:
       value_id_ = CSSValueNormal;
       break;
     case kItemPositionStretch:
       value_id_ = CSSValueStretch;
       break;
     case kItemPositionBaseline:
       value_id_ = CSSValueBaseline;
       break;
@@ skipping 322 matching lines @@
     default:
       break;
   }
   NOTREACHED();
   return kContainsNone;
 }
 
 }  // namespace blink
 
 #endif