Serialize zIndex as an integer

Source/core/css/CSSPrimitiveValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2012 Apple Inc. 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 420 matching lines @@
     case CSS_CALC_PERCENTAGE_WITH_LENGTH:
         ASSERT_NOT_REACHED();
         break;
     case CSS_SHAPE:
         // We must not call deref() when oilpan is enabled because m_value.shape is traced.
 #if !ENABLE(OILPAN)
         m_value.shape->deref();
 #endif
         break;
     case CSS_NUMBER:
+    case CSS_INTEGER:
     case CSS_PERCENTAGE:
     case CSS_EMS:
     case CSS_QEM:
     case CSS_EXS:
     case CSS_REMS:
     case CSS_CHS:
     case CSS_PX:
     case CSS_CM:
     case CSS_MM:
     case CSS_IN:
@@ skipping 396 matching lines @@
 
 static String formatNumber(double number, const char* characters)
 {
     return formatNumber(number, characters, strlen(characters));
 }
 
 const char* CSSPrimitiveValue::unitTypeToString(UnitType type)
 {
     switch (type) {
     case CSS_NUMBER:
+    case CSS_INTEGER:
         return "";
     case CSS_PERCENTAGE:
         return "%";
     case CSS_EMS:
         return "em";
     case CSS_EXS:
         return "ex";
     case CSS_REMS:
         return "rem";
     case CSS_CHS:
@@ skipping 71 matching lines @@
     if (m_hasCachedCSSText) {
         ASSERT(cssTextCache().contains(this));
         return cssTextCache().get(this);
     }
 
     String text;
     switch (m_primitiveUnitType) {
         case CSS_UNKNOWN:
             // FIXME
             break;
+        case CSS_INTEGER:
+            text = String::format("%d", getIntValue());
+            break;
         case CSS_NUMBER:
         case CSS_PERCENTAGE:
         case CSS_EMS:
         case CSS_EXS:
         case CSS_REMS:
         case CSS_CHS:
         case CSS_PX:
         case CSS_CM:
         case CSS_DPPX:
         case CSS_DPI:
@@ skipping 180 matching lines @@
         visitor->trace(m_value.shape);
         break;
     default:
         break;
     }
 #endif
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink