Add additive animation support for border-radius CSS properties

third_party/WebKit/LayoutTests/animations/composition/border-bottom-right-radius-composition.html

Index: third_party/WebKit/LayoutTests/animations/composition/border-bottom-right-radius-composition.html
diff --git a/third_party/WebKit/LayoutTests/animations/composition/object-position-composition.html b/third_party/WebKit/LayoutTests/animations/composition/border-bottom-right-radius-composition.html
similarity index 71%
copy from third_party/WebKit/LayoutTests/animations/composition/object-position-composition.html
copy to third_party/WebKit/LayoutTests/animations/composition/border-bottom-right-radius-composition.html
index 1b37e705b060f6470a0a6829a4ee30646610b787..e7af67c5ab299f63068e87467db56b96d71acf41 100644
--- a/third_party/WebKit/LayoutTests/animations/composition/object-position-composition.html
+++ b/third_party/WebKit/LayoutTests/animations/composition/border-bottom-right-radius-composition.html
@@ -3,7 +3,7 @@
 <script src="../interpolation/resources/interpolation-test.js"></script>
 <script>
 assertComposition({
-  property: 'object-position',
+  property: 'border-bottom-right-radius',
   underlying: '40px 40px',
   addFrom: '60px 60px',
   addTo: '160px 160px',
@@ -18,22 +18,7 @@ assertComposition({
 ]);
 
 assertComposition({
-  property: 'object-position',
-  underlying: 'top 20% left 40%',
-  addFrom: 'left 60% top 80%',
-  addTo: 'right 80% bottom 40%',
-}, [
-  {at: -0.25, is: '110% 105%'},
-  {at: 0, is: '100% 100%'},
-  {at: 0.25, is: '90% 95%'},
-  {at: 0.5, is: '80% 90%'},
-  {at: 0.75, is: '70% 85%'},
-  {at: 1, is: '60% 80%'},
-  {at: 1.25, is: '50% 75%'},
-]);
-
-assertComposition({
-  property: 'object-position',
+  property: 'border-bottom-right-radius',
   underlying: '40px 40px',
   replaceFrom: '100px 100px',
   addTo: '160px 160px',
@@ -48,7 +33,7 @@ assertComposition({
 ]);
 
 assertComposition({
-  property: 'object-position',
+  property: 'border-bottom-right-radius',
   underlying: '40px 40px',
   addFrom: '60px 60px',
   replaceTo: '200px 200px',