[css-align] Implement place-content alignment shorthand

third_party/WebKit/Source/core/css/StylePropertySerializer.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 436 matching lines @@
     case CSSPropertyFlexFlow:
       return getShorthandValue(flexFlowShorthand());
     case CSSPropertyGridColumn:
       return getShorthandValue(gridColumnShorthand(), " / ");
     case CSSPropertyGridRow:
       return getShorthandValue(gridRowShorthand(), " / ");
     case CSSPropertyGridArea:
       return getShorthandValue(gridAreaShorthand(), " / ");
     case CSSPropertyGridGap:
       return getShorthandValue(gridGapShorthand());
+    case CSSPropertyPlaceContent:
+      return placeContentPropertyValue();
     case CSSPropertyFont:
       return fontValue();
     case CSSPropertyFontVariant:
       return fontVariantValue();
     case CSSPropertyMargin:
       return get4Values(marginShorthand());
     case CSSPropertyMotion:
       return getShorthandValue(motionShorthand());
     case CSSPropertyOffset:
       return getShorthandValue(offsetShorthand());
@@ skipping 374 matching lines @@
     // FIXME: CSSInitialValue::cssText should generate the right value.
     String text = value->cssText();
     if (res.isNull())
       res = text;
     else if (res != text)
       return String();
   }
   return res;
 }
 
+String StylePropertySerializer::placeContentPropertyValue() const {
+  String value = getCommonValue(placeContentShorthand());
+  if (value.isNull() || value.isEmpty())
+    return getShorthandValue(placeContentShorthand());
+  return value;
+}
+
 String StylePropertySerializer::borderPropertyValue() const {
   const StylePropertyShorthand properties[3] = {
       borderWidthShorthand(), borderStyleShorthand(), borderColorShorthand()};
   StringBuilder result;
   for (size_t i = 0; i < WTF_ARRAY_LENGTH(properties); ++i) {
     String value = getCommonValue(properties[i]);
     if (value.isNull())
       return String();
     if (value == "initial")
       continue;
@@ skipping 66 matching lines @@
     const CSSValue& xValue =
         repeatXList ? repeatXList->item(i % repeatXList->length()) : repeatX;
     const CSSValue& yValue =
         repeatYList ? repeatYList->item(i % repeatYList->length()) : repeatY;
     appendBackgroundRepeatValue(builder, xValue, yValue);
   }
   return builder.toString();
 }
 
 }  // namespace blink