Find native classes with mixins in NativeClassFinder

pkg/compiler/lib/src/common_elements.dart

Index: pkg/compiler/lib/src/common_elements.dart
diff --git a/pkg/compiler/lib/src/common_elements.dart b/pkg/compiler/lib/src/common_elements.dart
index 1e238d0b009c77a03ee77eb06a80fa891caa4df2..9bce67b5318ab88182fba5b3eb5fe21baf5b0b32 100644
--- a/pkg/compiler/lib/src/common_elements.dart
+++ b/pkg/compiler/lib/src/common_elements.dart
@@ -1197,15 +1197,19 @@ abstract class ElementEnvironment {
 
   /// Returns the superclass of [cls].
   ///
-  /// Unnamed mixin applications are included, for instance for these classes
+  /// If [skipUnnamedMixinApplications] is `true`, unnamed mixin applications
+  /// are excluded, for instance for these classes
   ///
   ///     class S {}
   ///     class M {}
   ///     class C extends S with M {}
   ///
   /// the result of `getSuperClass(C)` is the unnamed mixin application
-  /// typically named `S+M` and `getSuperClass(S+M)` is `S`.
-  ClassEntity getSuperClass(ClassEntity cls);
+  /// typically named `S+M` and `getSuperClass(S+M)` is `S`, whereas
+  /// the result of `getSuperClass(C, skipUnnamedMixinApplications: false)` is
+  /// `S`.
+  ClassEntity getSuperClass(ClassEntity cls,
+      {bool skipUnnamedMixinApplications: false});
 
   void forEachSupertype(ClassEntity cls, void f(InterfaceType supertype));