CSS Properties and Values API: Implement computation / computational independence

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 1085 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;
 }
 
 const CSSValue& StyleBuilderConverter::convertRegisteredPropertyValue(const StyleResolverState& state, const CSSValue& value)
 {
-    // TODO(timloh): Resolve ems, etc.
+    // TODO(timloh): Images and transform-function values can also contain lengths.
+    if (value.isValueList()) {
+        CSSValueList* newList = CSSValueList::createSpaceSeparated();
+        for (const CSSValue* innerValue : toCSSValueList(value))
+            newList->append(convertRegisteredPropertyValue(state, *innerValue));
+        return *newList;
+    }
+
+    if (value.isPrimitiveValue()) {
+        const CSSPrimitiveValue& primitiveValue = toCSSPrimitiveValue(value);
+        if (primitiveValue.isCalculated() || CSSPrimitiveValue::isRelativeUnit(primitiveValue.typeWithCalcResolved())) {
+            // Instead of the actual zoom, use 1 to avoid potential rounding errors
+            Length length = primitiveValue.convertToLength(state.cssToLengthConversionData().copyWithAdjustedZoom(1));
+            return *CSSPrimitiveValue::create(length, 1);
+        }
+    }
     return value;
 }
 
 } // namespace blink