implement default analysis options in bazel

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

Index: pkg/analyzer/lib/src/generated/gn.dart
diff --git a/pkg/analyzer/lib/src/generated/gn.dart b/pkg/analyzer/lib/src/generated/gn.dart
index ea198335cf12ffe806c4b68a50d3a5885d855d63..be34963a4916950e13c68ba9d8dbb104e67cf538 100644
--- a/pkg/analyzer/lib/src/generated/gn.dart
+++ b/pkg/analyzer/lib/src/generated/gn.dart
@@ -8,8 +8,10 @@ import 'dart:collection';
 import 'dart:core';
 
 import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
+import 'package:analyzer/src/generated/workspace.dart';
 import 'package:analyzer/src/util/fast_uri.dart';
 import 'package:path/path.dart';
 
@@ -132,7 +134,7 @@ class GnPackageUriResolver extends UriResolver {
 /**
  * Information about a Gn workspace.
  */
-class GnWorkspace {
+class GnWorkspace extends Workspace {
   /**
    * The name of the directory that identifies the root of the workspace.
    */
@@ -156,9 +158,7 @@ class GnWorkspace {
 
   GnWorkspace._(this.provider, this.root, this.packages);
 
-  /**
-   * Return a map of package sources.
-   */
+  @override
   Map<String, List<Folder>> get packageMap {
     Map<String, List<Folder>> result = new HashMap<String, List<Folder>>();
     packages.forEach((package, sourceDir) {
@@ -167,6 +167,20 @@ class GnWorkspace {
     return result;
   }
 
+  @override
+  UriResolver get packageUriResolver => new GnPackageUriResolver(this);
+
+  @override
+  SourceFactory createSourceFactory(DartSdk sdk) {
+    List<UriResolver> resolvers = <UriResolver>[];
+    if (sdk != null) {
+      resolvers.add(new DartUriResolver(sdk));
+    }
+    resolvers.add(packageUriResolver);
+    resolvers.add(new GnFileUriResolver(this));
+    return new SourceFactory(resolvers, null, provider);
+  }
+
   /**
    * Return the file with the given [absolutePath].
    *