Remove Registry arguments from Enqueuer.

pkg/compiler/lib/src/common/backend_api.dart

Index: pkg/compiler/lib/src/common/backend_api.dart
diff --git a/pkg/compiler/lib/src/common/backend_api.dart b/pkg/compiler/lib/src/common/backend_api.dart
index b095b230809e7c65cb78c1e79b78df1a36adc1e8..487f01d4cb6f0daac9c3bc005341636d41428131 100644
--- a/pkg/compiler/lib/src/common/backend_api.dart
+++ b/pkg/compiler/lib/src/common/backend_api.dart
@@ -159,9 +159,15 @@ abstract class Backend {
                                 Enqueuer enqueuer,
                                 Registry registry) {}
 
-  /// Called to notify to the backend that an interface type has been
-  /// instantiated.
-  void registerInstantiatedType(InterfaceType type, Registry registry) {}
+  /// Called to instruct to the backend register [type] as instantiated on
+  /// [enqueuer].
+  void registerInstantiatedType(InterfaceType type,
+                                Enqueuer enqueuer,
+                                Registry registry,
+                                {bool mirrorUsage: false}) {
+    registry.registerDependency(type.element);
+    enqueuer.registerInstantiatedType(type, mirrorUsage: mirrorUsage);
+  }
 
   /// Register an is check to the backend.
   void registerIsCheckForCodegen(DartType type,
@@ -182,14 +188,14 @@ abstract class Backend {
       Enqueuer enqueuer,
       Registry registry) {}
 
-  /**
-   * Call this to register that a getter exists for a function on an
-   * instantiated generic class.
-   */
+  /// Called to instruct the backend to register that a closure exists for a
+  /// function on an instantiated generic class.
   void registerClosureWithFreeTypeVariables(
       Element closure,
       Enqueuer enqueuer,
-      Registry registry) {}
+      Registry registry) {
+    enqueuer.universe.closuresWithFreeTypeVariables.add(closure);
+  }
 
   /// Call this to register that a member has been closurized.
   void registerBoundClosure(Enqueuer enqueuer) {}