Implement animations for Independent CSS Transform Properties

Source/platform/transforms/TransformOperation.h

Index: Source/platform/transforms/TransformOperation.h
diff --git a/Source/platform/transforms/TransformOperation.h b/Source/platform/transforms/TransformOperation.h
index b131f3ae5811df844eeaa1fc1c3b6cc3a2b3a2cd..fb7f6c71ce5e6d0f0e2c36cdd88aea02f0aaf046 100644
--- a/Source/platform/transforms/TransformOperation.h
+++ b/Source/platform/transforms/TransformOperation.h
@@ -83,6 +83,9 @@ public:
     virtual bool dependsOnBoxSize() const { return false; }
 };
 
+#define DEFINE_TRANSFORM_TYPE_CASTS(thisType) \
+    DEFINE_TYPE_CASTS(thisType, TransformOperation, transform, thisType::isMatchingOperationType(transform->type()), thisType::isMatchingOperationType(transform.type()))
+
 } // namespace blink
 
 #endif // TransformOperation_h