Changed CSSPropertyObjectPosition to use legacy interpolation

Changed CSSPropertyObjectPosition back to use legacy interpolation, as
the new interpolation doesn't support interpolating between pairs and
pairs-of-pairs.

Suspected CL:
https://chromium.googlesource.com/chromium/blink/+/a3be631e4554bcf918ef17f31112a3f7d93f376d.

BUG=526738

Review URL: https://codereview.chromium.org/1325783004

git-svn-id: svn://svn.chromium.org/blink/trunk@201528 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/animations/interpolation/object-position-interpolation.html

@@ -129,5 +129,20 @@ assertInterpolation({
   {at: 1, is: '100% 0%'},
   {at: 1.5, is: '125% -25%'}
 ]);
+
+assertInterpolation({
+  property: 'object-position',
+  from: 'center',
+  to: 'right bottom 100%',
+}, [
+  {at: -0.5, is: '25% 75%'},
+  {at: 0, is: 'center'},
+  {at: 0.3, is: '65% 35%'},
+  {at: 0.5, is: '75% 25%'},
+  {at: 0.9, is: '95% 5%'},
+  {at: 1, is: 'right bottom 100%'},
+  {at: 1.5, is: '125% -25%'},
+  {at: 2, is: '150% -50%'},
+]);
 </script>
 </body>

third_party/WebKit/Source/core/animation/StringKeyframe.cpp

@@ -377,11 +377,8 @@ PassRefPtrWillBeRawPtr<Interpolation> StringKeyframe::CSSPropertySpecificKeyfram
     case CSSPropertyBorderBottomRightRadius:
     case CSSPropertyBorderTopLeftRadius:
     case CSSPropertyBorderTopRightRadius:
-        range = RangeNonNegative;
-        // Fall through
-    case CSSPropertyObjectPosition:
         if (LengthPairStyleInterpolation::canCreateFrom(*fromCSSValue) && LengthPairStyleInterpolation::canCreateFrom(*toCSSValue))
-            return LengthPairStyleInterpolation::create(*fromCSSValue, *toCSSValue, property, range);
+            return LengthPairStyleInterpolation::create(*fromCSSValue, *toCSSValue, property, RangeNonNegative);
         break;
 
     case CSSPropertyPerspectiveOrigin: