dart2dart: Test cases for better code coverage in dart_tree rewritings.

sdk/lib/_internal/compiler/implementation/dart2js_profile_many.dart

+// Copyright (c) 2014, 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.profile_many;
+
+import 'dart2js.dart' as cmdline;
+import 'dart:async';
+
+const String USAGE =
+"""
+Usage: dart2js_profile_many.dart [OPTIONS] [FILES]
+
+Invokes dart2js separately for each file using the given options.
+This is for profiling multiple compilations in the Dart Observatory.
+""";
+
+printUsage() {
+  print(USAGE);
+}
+
+void main(List<String> args) {
+
+  List options = [];
+  List files = [];
+
+  for (String arg in args) {
+    if (arg.startsWith('-')) {
+      options.add(arg);
+    } else {
+      files.add(arg);
+    }
+  }
+
+  if (files.length == 0) {
+    printUsage();
+    return;
+  }
+
+  cmdline.exitFunc = (code) {
+    throw "Exit with code $code";
+  };
+
+  Future.forEach(files, (String file) {
+    List subargs = [];
+    subargs.addAll(options);
+    subargs.add(file);
+    return cmdline.compilerMain(subargs).catchError((e) {  });
+  }).then((_) {
+    print("Done");
+  });
+
+
+}