Add support for the object-position CSS property.

Source/core/page/animation/CSSPropertyAnimation.cpp

Index: Source/core/page/animation/CSSPropertyAnimation.cpp
diff --git a/Source/core/page/animation/CSSPropertyAnimation.cpp b/Source/core/page/animation/CSSPropertyAnimation.cpp
index 5b31b8cd969b461626c9ead77572993e0e8c2a99..4f5ab988a32a5a21eeeca6519727f8ee6dafd321 100644
--- a/Source/core/page/animation/CSSPropertyAnimation.cpp
+++ b/Source/core/page/animation/CSSPropertyAnimation.cpp
@@ -85,6 +85,11 @@ static inline LengthSize blendFunc(const AnimationBase* anim, const LengthSize&
                       blendFunc(anim, from.height(), to.height(), progress));
 }
 
+static inline LengthPoint blendFunc(const AnimationBase* anim, const LengthPoint& from, const LengthPoint& to, double progress)
+{
+    return LengthPoint(blendFunc(anim, from.x(), to.x(), progress), blendFunc(anim, from.y(), to.y(), progress));
+}
+
 static inline IntSize blendFunc(const AnimationBase* anim, const IntSize& from, const IntSize& to, double progress)
 {
     return IntSize(blendFunc(anim, from.width(), to.width(), progress),
@@ -1110,6 +1115,8 @@ void CSSPropertyAnimation::ensurePropertyMap()
     gPropertyWrappers->append(new FillLayersPropertyWrapper(CSSPropertyWebkitMaskPositionY, &RenderStyle::maskLayers, &RenderStyle::accessMaskLayers));
     gPropertyWrappers->append(new FillLayersPropertyWrapper(CSSPropertyWebkitMaskSize, &RenderStyle::maskLayers, &RenderStyle::accessMaskLayers));
 
+    gPropertyWrappers->append(new PropertyWrapper<LengthPoint>(CSSPropertyObjectPosition, &RenderStyle::objectPosition, &RenderStyle::setObjectPosition));
+
     gPropertyWrappers->append(new PropertyWrapper<float>(CSSPropertyFontSize,
         // Must pass a specified size to setFontSize if Text Autosizing is enabled, but a computed size
         // if text zoom is enabled (if neither is enabled it's irrelevant as they're probably the same).