Add additive animation support for border-radius CSS properties

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

Index: third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp
diff --git a/third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp b/third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp
index d09df4f7dd0c79c7f8f765fb15f9273fcbbd8146..c1708aa6fb199b69b955af4733d5893ef6abdbe0 100644
--- a/third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp
+++ b/third_party/WebKit/Source/core/animation/PropertyInterpolationTypesMapping.cpp
@@ -12,6 +12,7 @@
 #include "core/animation/CSSImageListInterpolationType.h"
 #include "core/animation/CSSLengthInterpolationType.h"
 #include "core/animation/CSSLengthListInterpolationType.h"
+#include "core/animation/CSSLengthPairInterpolationType.h"
 #include "core/animation/CSSNumberInterpolationType.h"
 #include "core/animation/CSSPaintInterpolationType.h"
 #include "core/animation/CSSPathInterpolationType.h"
@@ -179,6 +180,12 @@ const InterpolationTypes* PropertyInterpolationTypesMapping::get(const PropertyH
         case CSSPropertyObjectPosition:
             applicableTypes->append(adoptPtr(new CSSPositionInterpolationType(cssProperty)));
             break;
+        case CSSPropertyBorderBottomLeftRadius:
+        case CSSPropertyBorderBottomRightRadius:
+        case CSSPropertyBorderTopLeftRadius:
+        case CSSPropertyBorderTopRightRadius:
+            applicableTypes->append(adoptPtr(new CSSLengthPairInterpolationType(cssProperty)));
+            break;
         default:
             // TODO(alancutter): Support all interpolable CSS properties here so we can stop falling back to the old StyleInterpolation implementation.
             if (CSSPropertyMetadata::isInterpolableProperty(cssProperty))