Rework task model graphing to work on buildbots.

pkg/analyzer/tool/task_dependency_graph/check_test.dart

Index: pkg/analyzer/tool/task_dependency_graph/check_test.dart
diff --git a/pkg/analyzer/tool/task_dependency_graph/check_test.dart b/pkg/analyzer/tool/task_dependency_graph/check_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a2d1118b1393c4be89acaf8132cc9d349d98b4b8
--- /dev/null
+++ b/pkg/analyzer/tool/task_dependency_graph/check_test.dart
@@ -0,0 +1,34 @@
+// 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 task_dependency_graph.check_test;
+
+import 'dart:io';
+
+import 'package:path/path.dart';
+
+import 'generate.dart';
+
+/**
+ * Check that the target file has been code generated.  If it hasn't tell the
+ * user to run generate.dart.
+ */
+main() {
+  String script = Platform.script.toFilePath(windows: Platform.isWindows);
+  Driver driver = new Driver();
+  if (!driver.checkFile()) {
+    print('${driver.file.absolute} does not have expected contents.');
+    print('Please regenerate using:');
+    String executable = Platform.executable;
+    String packageRoot = '';
+    if (Platform.packageRoot.isNotEmpty) {
+      packageRoot = ' --package-root=${Platform.packageRoot}';
+    }
+    String generateScript = join(dirname(script), 'generate.dart');
+    print('  $executable$packageRoot $generateScript');
+    exit(1);
+  } else {
+    print('Generated file is up to date.');
+  }
+}