Add union types to the analysis server API spec.

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 144 matching lines @@
   /**
    * {@code analysis.updateContent}
    *
    * Update the content of one or more files. Files that were previously updated but not included in
    * this update remain unchanged. This effectively represents an overlay of the filesystem. The
    * files whose content is overridden are therefore seen by server as being files with the given
    * content, even if the files do not exist on the filesystem or if the file path represents the
    * path to a directory on the filesystem.
    *
    * @param files A table mapping the files whose content has changed to a description of the content
-   *         change. Each value should be one of the following types: AddContentOverlay,
-   *         ChangeContentOverlay, or RemoveContentOverlay.
+   *         change.
    */
   public void analysis_updateContent(Map<String, Object> files);
 
   /**
    * {@code analysis.updateOptions}
    *
    * Update the options controlling analysis based on the given set of options. Any options that are
    * not included in the analysis options will not be changed. If there are options in the analysis
    * options that are not valid an error will be reported but the values of the valid options will
    * still be updated.
@@ skipping 217 matching lines @@
   public void server_shutdown();
 
   /**
    * Start the analysis server.
    *
    * @param millisToRestart the number of milliseconds to wait for an unresponsive server before
    *          restarting it, or zero if the server should not be restarted.
    */
   public void start(long millisToRestart) throws Exception;
 }