Add additive animation support for CSS properties perspective-origin and object-position

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

Index: third_party/WebKit/LayoutTests/animations/interpolation/object-position-interpolation.html
diff --git a/third_party/WebKit/LayoutTests/animations/interpolation/object-position-interpolation.html b/third_party/WebKit/LayoutTests/animations/interpolation/object-position-interpolation.html
index 2c700bf3238eb28cbed8b9de5f26387e335138b6..bd21438669f2996df0616074f054960d300dc327 100644
--- a/third_party/WebKit/LayoutTests/animations/interpolation/object-position-interpolation.html
+++ b/third_party/WebKit/LayoutTests/animations/interpolation/object-position-interpolation.html
@@ -133,16 +133,16 @@ assertInterpolation({
 assertInterpolation({
   property: 'object-position',
   from: 'center',
-  to: 'right bottom 100%',
+  to: 'right bottom 50%',

[Eric Willigers, 2016/02/10 10:12:56]

Why change to 50% ? 

[alancutter (OOO until 2018), 2016/02/11 01:22:27]

Transitions outputs 0px instead of 0% for bottom 100%, I'm side stepping having
to add an expectations file by using 50%.

 }, [
-  {at: -0.5, is: '25% 75%'},
+  {at: -0.5, is: '25% 50%'},
   {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%'},
+  {at: 0.3, is: '65% 50%'},
+  {at: 0.5, is: '75% 50%'},
+  {at: 0.9, is: '95% 50%'},
+  {at: 1, is: '100% 50%'},
+  {at: 1.5, is: '125% 50%'},
+  {at: 2, is: '150% 50%'},
 ]);
 </script>
 </body>