Add package root setting to analysis server API.

editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/AnalysisServer.java

 /*
  * Copyright (c) 2014, the Dart project authors.
  *
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  *
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 85 matching lines @@
    * but they will remain in the set of requested roots.
    *
    * If an included path represents a file, then server will look in the directory containing the
    * file for a pubspec.yaml file. If none is found, then the parents of the directory will be
    * searched until such a file is found or the root of the file system is reached. If such a file is
    * found, it will be used to resolve package: URI’s within the file.
    *
    * @param included A list of the files and directories that should be analyzed.
    * @param excluded A list of the files and directories within the included directories that should
    *         not be analyzed.
+   * @param packageRoots A mapping from source directories to target directories that should override
+   *         the normal package: URI resolution mechanism. The analyzer will behave as though each
+   *         source directory in the map contains a special pubspec.yaml file which resolves any
+   *         package: URI to the corresponding path within the target directory. The effect is the
+   *         same as specifying the target directory as a "--package_root" parameter to the Dart VM
+   *         when executing any Dart file inside the source directory. If this field is absent, or
+   *         the empty map is specified, then all package: URI's are resolved the normal pubspec.yaml
+   *         mechanism.
    */
-  public void analysis_setAnalysisRoots(List<String> included, List<String> excluded);
+  public void analysis_setAnalysisRoots(List<String> included, List<String> excluded, Map<String, String> packageRoots);
 
   /**
    * {@code analysis.setPriorityFiles}
    *
    * Set the priority files to the files in the given list. A priority file is a file that is given
    * priority when scheduling which analysis work to do first. The list typically contains those
    * files that are visible to the user and those for which analysis results will have the biggest
    * impact on the user experience. The order of the files within the list is significant: the first
    * file will be given higher priority than the second, the second higher priority than the third,
    * and so on.
@@ skipping 292 matching lines @@
    * the response to this request has been sent.
    */
   public void server_shutdown();
 
   /**
    * Start the analysis server.
    */
   public void start() throws Exception;
 
 }