Store [-webkit-]perspective-origin as a LengthPoint.

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 588 matching lines @@
 
     // CSSPropertyWebkitPerspective accepts unitless numbers.
     if (primitiveValue->isNumber()) {
         RefPtr<CSSPrimitiveValue> px = CSSPrimitiveValue::create(primitiveValue->getDoubleValue(), CSSPrimitiveValue::CSS_PX);
         return convertPerspectiveLength(state, px.get());
     }
 
     return convertPerspectiveLength(state, primitiveValue);
 }
 
+template <CSSValueID cssValueFor0, CSSValueID cssValueFor100>
+static Length convertOriginLength(StyleResolverState& state, CSSPrimitiveValue* primitiveValue)
+{
+    if (primitiveValue->isValueID()) {
+        switch (primitiveValue->getValueID()) {
+        case cssValueFor0:
+            return Length(0, Percent);
+        case cssValueFor100:
+            return Length(100, Percent);
+        case CSSValueCenter:
+            return Length(50, Percent);
+        default:
+            ASSERT_NOT_REACHED();
+            return Length(0, Percent);

[Timothy Loh, 2014/10/10 15:04:20]

Since we never get here, do we need to bother with this return? convertLength
will return a sane default anyway if we have an unexpected value.

+        }
+    }
+
+    return StyleBuilderConverter::convertLength(state, primitiveValue);
+}
+
+LengthPoint StyleBuilderConverter::convertPerspectiveOrigin(StyleResolverState& state, CSSValue* value)
+{
+    CSSValueList* list = toCSSValueList(value);
+    ASSERT(list->length() == 2);
+
+    CSSPrimitiveValue* primitiveValueX = toCSSPrimitiveValue(list->item(0));
+    CSSPrimitiveValue* primitiveValueY = toCSSPrimitiveValue(list->item(1));
+
+    return LengthPoint(
+        convertOriginLength<CSSValueLeft, CSSValueRight>(state, primitiveValueX),
+        convertOriginLength<CSSValueTop, CSSValueBottom>(state, primitiveValueY)
+    );
+}
+
 EPaintOrder StyleBuilderConverter::convertPaintOrder(StyleResolverState&, CSSValue* cssPaintOrder)
 {
     if (cssPaintOrder->isValueList()) {
         int paintOrder = 0;
         const CSSValueList& list = *toCSSValueList(cssPaintOrder);
         for (size_t i = 0; i < list.length(); ++i) {
             EPaintOrderType paintOrderType = PT_NONE;
             switch (toCSSPrimitiveValue(list.item(i))->getValueID()) {
             case CSSValueFill:
                 paintOrderType = PT_FILL;
@@ skipping 132 matching lines @@
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     if (primitiveValue->getValueID()) {
         float multiplier = convertLineWidth<float>(state, value);
         return CSSPrimitiveValue::create(multiplier / 48, CSSPrimitiveValue::CSS_EMS)->computeLength<float>(state.cssToLengthConversionData());
     }
     return primitiveValue->computeLength<float>(state.cssToLengthConversionData());
 }
 
 } // namespace blink