Handle deferred access as pre-step in SemanticSendVisitor.

tests/compiler/dart2js/semantic_visitor_test.dart

 // Copyright (c) 2015, 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.semantics_visitor_test;
 
 import 'dart:async';
 import 'dart:mirrors';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
@@ skipping 124 matching lines @@
     }
     if (initializers != null) {
       sb.write(',initializers=$initializers');
     }
     return sb.toString();
   }
 }
 
 class Test {
   final String codeByPrefix;
+  final bool isDeferred;
   final String code;
   final /*Visit | List<Visit>*/ expectedVisits;
   final String cls;
   final String method;
 
   const Test(this.code, this.expectedVisits)
-      : cls = null, method = 'm', codeByPrefix = null;
+      : cls = null, method = 'm', codeByPrefix = null, isDeferred = false;
   const Test.clazz(this.code, this.expectedVisits,
                    {this.cls: 'C', this.method: 'm'})
-      : codeByPrefix = null;
-  const Test.prefix(this.codeByPrefix, this.code, this.expectedVisits)
+      : codeByPrefix = null, isDeferred = false;
+  const Test.prefix(this.codeByPrefix, this.code, this.expectedVisits,
+                   {this.isDeferred: false})
       : cls = null, method = 'm';
 
   String toString() {
     StringBuffer sb = new StringBuffer();
     sb.writeln();
     sb.writeln(code);
     if (codeByPrefix != null) {
       sb.writeln('imported by prefix:');
       sb.writeln(codeByPrefix);
     }
@@ skipping 103 matching lines @@
   StringBuffer mainSource = new StringBuffer();
   int index = 0;
   TESTS.forEach((String group, List<Test> tests) {
     if (arguments.isNotEmpty && !arguments.contains(group)) return;
 
     tests.forEach((Test test) {
       StringBuffer testSource = new StringBuffer();
       if (test.codeByPrefix != null) {
         String prefixFilename = 'pre$index.dart';
         sourceFiles[prefixFilename] = test.codeByPrefix;
-        testSource.writeln("import '$prefixFilename' as p;");
+        if (test.isDeferred) {
+          testSource.writeln("import '$prefixFilename' deferred as p;");
+        } else {
+          testSource.writeln("import '$prefixFilename' as p;");
+        }
       }
 
       String filename = 'lib$index.dart';
       testSource.writeln(test.code);
       sourceFiles[filename] = testSource.toString();
       mainSource.writeln("import '$filename';");
       testMap[filename] = test;
       index++;
     });
   });
@@ skipping 406 matching lines @@
   VISIT_IF_NOT_NULL_DYNAMIC_PROPERTY_COMPOUND,
   VISIT_IF_NOT_NULL_DYNAMIC_PROPERTY_PREFIX,
   VISIT_IF_NOT_NULL_DYNAMIC_PROPERTY_POSTFIX,
 
   ERROR_INVALID_ASSERT,
   ERROR_UNDEFINED_UNARY_EXPRESSION,
   ERROR_UNDEFINED_BINARY_EXPRESSION,
 
   VISIT_CONSTANT_GET,
   VISIT_CONSTANT_INVOKE,
+
+  PREVISIT_DEFERRED_ACCESS,
 }