Move background related shorthands into CSSPropertyParser

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

Index: third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.h
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.h b/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.h
index 101b00f62ce96782edb5ad177a3b354008c23c98..67552621e1bc9ddda3e3ad9f9320f248400f0727 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.h
+++ b/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.h
@@ -110,6 +110,7 @@ public:
     static PassRefPtr<StylePath> convertPath(StyleResolverState&, const CSSValue&);
     static PassRefPtr<StylePath> convertPathOrNone(StyleResolverState&, const CSSValue&);
     static StyleMotionRotation convertMotionRotation(const CSSValue&);
+    template <CSSValueID cssValueFor0, CSSValueID cssValueFor100> static Length convertOriginLength(StyleResolverState&, const CSSPrimitiveValue&);
 };
 
 template <typename T>
@@ -164,6 +165,25 @@ AtomicString StyleBuilderConverter::convertString(StyleResolverState&, const CSS
     return nullAtom;
 }
 
+template <CSSValueID cssValueFor0, CSSValueID cssValueFor100>
+Length StyleBuilderConverter::convertOriginLength(StyleResolverState& state, const 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 StyleBuilderConverter::convertLength(state, primitiveValue);
+}
+
 } // namespace blink
 
 #endif