Make CSSValueList store const CSSValues

third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 125 matching lines @@
         return FontDescription::FantasyFamily;
     case CSSValueMonospace:
         return FontDescription::MonospaceFamily;
     case CSSValueWebkitPictograph:
         return FontDescription::PictographFamily;
     default:
         return FontDescription::NoFamily;
     }
 }
 
-static bool convertFontFamilyName(StyleResolverState& state, CSSValue& value,
+static bool convertFontFamilyName(StyleResolverState& state, const CSSValue& value,
     FontDescription::GenericFamilyType& genericFamily, AtomicString& familyName)
 {
     if (value.isFontFamilyValue()) {
         genericFamily = FontDescription::NoFamily;
         familyName = AtomicString(toCSSFontFamilyValue(value).value());
     } else if (state.document().settings()) {
         genericFamily = convertGenericFamily(toCSSPrimitiveValue(value).getValueID());
         familyName = state.fontBuilder().genericFontFamilyName(genericFamily);
     }
 
@@ skipping 323 matching lines @@
 
     const 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;
     String gridLineName;
 
     auto it = values.begin();
-    CSSValue* currentValue = it->get();
+    const CSSValue* currentValue = it->get();
     if (currentValue->isPrimitiveValue() && toCSSPrimitiveValue(currentValue)->getValueID() == CSSValueSpan) {
         isSpanPosition = true;
         ++it;
         currentValue = it != values.end() ? it->get() : nullptr;
     }
 
     if (currentValue && currentValue->isPrimitiveValue() && toCSSPrimitiveValue(currentValue)->isNumber()) {
         gridLineNumber = toCSSPrimitiveValue(currentValue)->getIntValue();
         ++it;
         currentValue = it != values.end() ? it->get() : nullptr;
@@ skipping 545 matching lines @@
 
 PassRefPtr<StylePath> StyleBuilderConverter::convertPathOrNone(StyleResolverState& state, const CSSValue& value)
 {
     if (value.isPathValue())
         return toCSSPathValue(value).stylePath();
     ASSERT(value.isPrimitiveValue() && toCSSPrimitiveValue(value).getValueID() == CSSValueNone);
     return nullptr;
 }
 
 } // namespace blink