Use entities in some full_emitter sublibraries

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.backend_api;
 
 import 'dart:async' show Future;
 
 import '../common.dart';
 import '../common/codegen.dart' show CodegenImpact;
@@ skipping 244 matching lines @@
 
   /// Called by [MirrorUsageAnalyzerTask] after it has merged all @MirrorsUsed
   /// annotations. The arguments corresponds to the unions of the corresponding
   /// fields of the annotations.
   void registerMirrorUsage(
       Set<String> symbols, Set<Element> targets, Set<Element> metaTargets) {}
 
   /// Returns true if this element needs reflection information at runtime.
   bool isAccessibleByReflection(Element element) => true;
 
+  /// Returns true if this member element needs reflection information at
+  /// runtime.
+  bool isMemberAccessibleByReflection(MemberElement element) => true;
+
   /// Returns true if this element is covered by a mirrorsUsed annotation.
   ///
   /// Note that it might still be ok to tree shake the element away if no
   /// reflection is used in the program (and thus [isTreeShakingDisabled] is
   /// still false). Therefore _do not_ use this predicate to decide inclusion
   /// in the tree, use [requiredByMirrorSystem] instead.
   bool referencedFromMirrorSystem(Element element, [recursive]) => false;
 
   /// Returns true if this element has to be enqueued due to
   /// mirror usage. Might be a subset of [referencedFromMirrorSystem] if
@@ skipping 141 matching lines @@
   ClassElement get indexableImplementation;
   ClassElement get mutableIndexableImplementation;
   ClassElement get indexingBehaviorImplementation;
   ClassElement get interceptorImplementation;
 
   bool isDefaultEqualityImplementation(MemberElement element);
   bool isInterceptorClass(ClassElement cls);
   bool isNativeClass(ClassElement element);
   bool isNativeMember(MemberElement element);
 }