Changed CSSPropertyObjectPosition to use legacy interpolation

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

Index: LayoutTests/animations/interpolation/object-position-interpolation.html
diff --git a/LayoutTests/animations/interpolation/object-position-interpolation.html b/LayoutTests/animations/interpolation/object-position-interpolation.html
index 2b55a161c1cd553a8e0c7113df0205fa751aac15..c2cdac689eb6bbb7ba664e707713ad23485a83ac 100644
--- a/LayoutTests/animations/interpolation/object-position-interpolation.html
+++ b/LayoutTests/animations/interpolation/object-position-interpolation.html
@@ -129,5 +129,15 @@ assertInterpolation({
   {at: 1, is: '100% 0%'},
   {at: 1.5, is: '125% -25%'}
 ]);
+
+// Bug 526738: Check that an element can be animated from a pair to a pair of pairs

[alancutter (OOO until 2018), 2015/09/01 03:38:45]

No need to add comment, git blame will be sufficient here.

[sashab, 2015/09/01 04:49:03]

Done.

+assertInterpolation({
+  property: 'object-position',
+  from: 'center',
+  to: 'right bottom 100%',
+}, [
+  {at: 0, is: 'center'},
+  {at: 1, is: 'right bottom 100%'},
+]);

[alancutter (OOO until 2018), 2015/09/01 03:38:45]

0 and 1 don't really test interpolation at all, we should test the fractions
that the other assertInterpolations test as well. You can set "rebase: true" in
interpolation-test.js for convenience in getting the expected value code.

[sashab, 2015/09/01 04:49:03]

Done.

 </script>
 </body>