Support intercepted getters, setters and index operations.

pkg/compiler/lib/src/js_emitter/old_emitter/container_builder.dart

 // Copyright (c) 2013, 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.
 
 part of dart2js.js_emitter;
 
 /// This class should morph into something that makes it easy to build
 /// JavaScript representations of libraries, class-sides, and instance-sides.
 /// Initially, it is just a placeholder for code that is moved from
 /// [CodeEmitterTask].
@@ skipping 320 matching lines @@
       addMemberField(member, builder);
     } else if (member.isFunction ||
                member.isGenerativeConstructorBody ||
                member.isGenerativeConstructor ||
                member.isAccessor) {
       addMemberMethod(member, builder);
     } else {
       compiler.internalError(member,
           'Unexpected kind: "${member.kind}".');
     }
-    if (member.isInstanceMember) emitExtraAccessors(member, builder);
+    if (member.isInstanceMember) {
+      emitExtraAccessors(member, builder);
+    }
   }
 
   void addMemberMethod(FunctionElement member, ClassBuilder builder) {
     MemberInfo info = analyzeMemberMethod(member);
     if (info != null) {
       addMemberMethodFromInfo(info, builder);
     }
   }
 
   MemberInfo analyzeMemberMethod(FunctionElement member) {
@@ skipping 314 matching lines @@
     assert(needsStubs != null);
     assert(canTearOff != null);
     assert(isClosure != null);
     assert(tearOffName != null || !canTearOff);
     assert(canBeReflected != null);
     assert(canBeApplied != null);
     assert(hasSuperAlias != null);
     assert(needStructuredInfo != null);
   }
 }