Add hook to command-line analyzer similar to server

pkg/analyzer_cli/lib/starter.dart

Index: pkg/analyzer_cli/lib/starter.dart
diff --git a/pkg/analyzer_cli/lib/starter.dart b/pkg/analyzer_cli/lib/starter.dart
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--- /dev/null
+++ b/pkg/analyzer_cli/lib/starter.dart
@@ -0,0 +1,40 @@
+// Copyright (c) 2016, 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 analyzer_cli.starter;
+
+import 'package:analyzer_cli/plugin/analysis/resolver_provider.dart';
+import 'package:analyzer_cli/src/driver.dart';
+import 'package:plugin/plugin.dart';
+
+/**
+ * An object that can be used to start a command-line analysis. This class
+ * exists so that clients can configure a command-line analyzer before starting
+ * it.
+ *
+ * Clients may not extend, implement or mix-in this class.
+ */
+abstract class CommandLineStarter {
+  /**
+   * Initialize a newly created starter to start up a command-line analysis.
+   */
+  factory CommandLineStarter() = Driver;
+
+  /**
+   * Set the package resolver provider used to override the way package URI's
+   * are resolved in some contexts. The provider should return `null` if the
+   * default package resolution scheme should be used instead.
+   */
+  void set packageResolverProvider(ResolverProvider provider);
+
+  /**
+   * Set the [plugins] that are defined outside the analyzer_cli package.
+   */
+  void set userDefinedPlugins(List<Plugin> plugins);
+
+  /**
+   * Use the given command-line [arguments] to start this analyzer.
+   */
+  void start(List<String> arguments);
+}