Add package root setting to analysis server API.

pkg/analysis_server/lib/src/context_manager.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 context.directory.manager;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 43 matching lines @@
    */
   List<String> excludedPaths = <String>[];
 
   /**
    * The list of included paths (folders and files) most recently passed to
    * [setRoots].
    */
   List<String> includedPaths = <String>[];
 
   /**
+   * The map of package roots most recently passed to [setRoots].
+   */
+  Map<String, String> packageRoots = <String, String>{};
+
+  /**
    * Provider which is used to determine the mapping from package name to
    * package folder.
    */
   final PackageMapProvider packageMapProvider;
 
   ContextManager(this.resourceProvider, this.packageMapProvider) {
     pathContext = resourceProvider.pathContext;
   }
 
   /**
@@ skipping 35 matching lines @@
   /**
    * Rebuild the set of contexts from scratch based on the data last sent to
    * setRoots().
    */
   void refresh() {
     // Destroy old contexts
     List<Folder> contextFolders = _contexts.keys.toList();
     contextFolders.forEach(_destroyContext);
 
     // Rebuild contexts based on the data last sent to setRoots().
-    setRoots(includedPaths, excludedPaths);
+    setRoots(includedPaths, excludedPaths, packageRoots);
   }
 
   /**
    * Change the set of paths which should be used as starting points to
    * determine the context directories.
    */
-  void setRoots(List<String> includedPaths, List<String> excludedPaths) {
+  void setRoots(List<String> includedPaths, List<String> excludedPaths,
+      Map<String, String> packageRoots) {
+    // TODO(paulberry): process package roots.
+    this.packageRoots = packageRoots;
     List<Folder> contextFolders = _contexts.keys.toList();
     // included
     Set<Folder> includedFolders = new HashSet<Folder>();
     for (int i = 0; i < includedPaths.length; i++) {
       String path = includedPaths[i];
       Resource resource = resourceProvider.getResource(path);
       if (resource is Folder) {
         includedFolders.add(resource);
       } else {
         // TODO(scheglov) implemented separate files analysis
@@ skipping 444 matching lines @@
     return excludes(resource.path);
   }
 
   /**
    * Returns `true` if [path] is the pubspec file of this context.
    */
   bool isPubspec(String path) {
     return path == pubspecPath;
   }
 }