Use entities in runtime_types

pkg/compiler/lib/src/elements/types.dart

Index: pkg/compiler/lib/src/elements/types.dart
diff --git a/pkg/compiler/lib/src/elements/types.dart b/pkg/compiler/lib/src/elements/types.dart
index ba4b8d1731d55adb4700d6902ed4a6512bb19d62..8d3a6468e76ae169d8451016afc4b31725a67927 100644
--- a/pkg/compiler/lib/src/elements/types.dart
+++ b/pkg/compiler/lib/src/elements/types.dart
@@ -753,4 +753,11 @@ abstract class DartTypes {
   /// Returns the supertype of [cls], i.e. the type in the `extends` clause of
   /// [cls].
   InterfaceType getSupertype(ClassEntity cls);
+
+  /// Returns all supertypes of [cls].
+  Iterable<InterfaceType> getSupertypes(ClassEntity cls);
+
+  /// Returns the type of the `call` method on [type], or `null` if the class
+  /// of [type] does not have a `call` method.
+  FunctionType getCallType(InterfaceType type);
 }