implement default analysis options in bazel

pkg/analyzer/lib/src/generated/workspace.dart

+// Copyright (c) 2017, 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.src.generated.workspace;
+
+import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/src/generated/sdk.dart';
+import 'package:analyzer/src/generated/source.dart';
+
+/**
+ * Abstract superclass of classes that provide information about the workspace
+ * in which analysis is being performed.
+ */
+abstract class Workspace {
+
+  /**
+   * Return a map of package sources.
+   */
+  Map<String, List<Folder>> get packageMap;
+
+  /**
+   * The [UriResolver] that can resolve `package` URIs.
+   */
+  UriResolver get packageUriResolver;
+
+  /**
+   * Create the [SourceFactory] for resolving Uris to [Source]s.
+   * The [sdk] may be `null`.
+   */
+  SourceFactory createSourceFactory(DartSdk sdk);
+}