Add additive animation support for CSS property motion-rotation

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 612 matching lines @@
 {
     const CSSPrimitiveValue& primitiveValue = toCSSPrimitiveValue(value);
     ASSERT(primitiveValue.isNumber() || primitiveValue.isPercentage());
     if (primitiveValue.isNumber())
         return primitiveValue.getFloatValue();
     return primitiveValue.getFloatValue() / 100.0f;
 }
 
 StyleMotionRotation StyleBuilderConverter::convertMotionRotation(StyleResolverState&, const CSSValue& value)
 {
+    return convertMotionRotation(value);
+}
+
+StyleMotionRotation StyleBuilderConverter::convertMotionRotation(const CSSValue& value)
+{
     StyleMotionRotation result(0, MotionRotationFixed);
 
     const CSSValueList& list = toCSSValueList(value);
     ASSERT(list.length() == 1 || list.length() == 2);
     for (const auto& item : list) {
         const CSSPrimitiveValue& primitiveValue = toCSSPrimitiveValue(*item);
         if (primitiveValue.getValueID() == CSSValueAuto) {
             result.type = MotionRotationAuto;
         } else if (primitiveValue.getValueID() == CSSValueReverse) {
             result.type = MotionRotationAuto;
@@ skipping 334 matching lines @@
 
 PassRefPtr<StylePath> StyleBuilderConverter::convertPathOrNone(StyleResolverState& state, const CSSValue& value)
 {
     if (value.isPathValue())
         return convertPath(state, value);
     ASSERT(value.isPrimitiveValue() && toCSSPrimitiveValue(value).getValueID() == CSSValueNone);
     return nullptr;
 }
 
 } // namespace blink