Support intercepted getters, setters and index operations.

pkg/compiler/lib/src/js_backend/codegen/unsugar.dart

Index: pkg/compiler/lib/src/js_backend/codegen/unsugar.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/unsugar.dart b/pkg/compiler/lib/src/js_backend/codegen/unsugar.dart
index aa560120245f4bb17de3819344670be71add2986..6ac5781a5fee65a335af5ad6d7ac9b5c57ab2528 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/unsugar.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/unsugar.dart
@@ -6,9 +6,9 @@ import '../../cps_ir/cps_ir_nodes.dart';
 import '../../cps_ir/optimizers.dart';
 import '../../constants/expressions.dart';
 import '../../constants/values.dart';
-import '../../elements/elements.dart' show ClassElement, FieldElement;
+import '../../elements/elements.dart' show ClassElement, FieldElement, Element;
 import '../../js_backend/codegen/glue.dart';
-import '../../dart2jslib.dart' show Selector;
+import '../../dart2jslib.dart' show Selector, World;
 
 /// Rewrites the initial CPS IR to make Dart semantics explicit and inserts
 /// special nodes that respect JavaScript behavior.
@@ -49,18 +49,14 @@ class UnsugarVisitor extends RecursiveVisitor {
 
   processInvokeMethod(InvokeMethod node) {
     Selector selector = node.selector;
+    // TODO(karlklose):  should we rewrite all selectors?
     if (!_glue.isInterceptedSelector(selector)) return;
 
-    if (!selector.isCall && !selector.isOperator) {
-      // TODO(karlklose): handle special selectors.
-      return;
-    }
-
+    Primitive receiver = node.receiver.definition;
     Set<ClassElement> interceptedClasses =
         _glue.getInterceptedClassesOn(selector);
     _glue.registerSpecializedGetInterceptor(interceptedClasses);
 
-    Primitive receiver = node.receiver.definition;
     Primitive intercepted = new Interceptor(receiver, interceptedClasses);
     insertLetPrim(intercepted, node);
     node.arguments.insert(0, node.receiver);