Added support for exports and re-exports.

tests/compiler/dart2js/patch_test.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.
 
 #import("../../../lib/compiler/implementation/leg.dart");
 #import("../../../lib/compiler/implementation/elements/elements.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 #import("../../../lib/compiler/implementation/util/util.dart");
 #import("mock_compiler.dart");
 #import("parser_helper.dart");
 #import("dart:uri");
 
 Compiler applyPatch(String script, String patch) {
   String core = "$DEFAULT_CORELIB\n$script";
   MockCompiler compiler = new MockCompiler(coreSource: core);
   var uri = new Uri("core.dartp");
   compiler.sourceFiles[uri.toString()] = new MockFile(patch);
-  compiler.patchParser.patchLibrary(uri, compiler.coreLibrary);
+  var handler = new LibraryDependencyHandler(compiler);
+  compiler.patchParser.patchLibrary(handler, uri, compiler.coreLibrary);
+  handler.computeExports();
   return compiler;
 }
 
 void expectHasBody(compiler, Element element) {
     var node = element.parseNode(compiler);
     Expect.isNotNull(node, "Element isn't parseable, when a body was expected");
     Expect.isNotNull(node.body);
     // If the element has a body it is either a Block or a Return statement,
     // both with different begin and end tokens.
     Expect.isTrue(node.body is Block || node.body is Return);
@@ skipping 330 matching lines @@
 
 main() {
   testPatchFunction();
   testPatchMember();
   testPatchGetter();
   testRegularMember();
   testGhostMember();
   testInjectFunction();
   testPatchSignatureCheck();
 }