Add a new experimental 'flutter' domain and move FLUTTER_OUTLINE there.

R=brianwilkerson@google.com, devoncarew@google.com

Change-Id: I8f829f10a630e38c5a3f1638d077e37832a08daa
Reviewed-on: https://dart-review.googlesource.com/36320
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>

pkg/analysis_server/tool/spec/generated/java/AnalysisServer.java

@@ -626,6 +626,35 @@ public interface AnalysisServer {
    */
   public void execution_setSubscriptions(List<String> subscriptions);
 
+  /**
+   * {@code flutter.setSubscriptions}
+   *
+   * Subscribe for services that are specific to individual files. All previous subscriptions are
+   * replaced by the current set of subscriptions. If a given service is not included as a key in the
+   * map then no files will be subscribed to the service, exactly as if the service had been included
+   * in the map with an explicit empty list of files.
+   *
+   * Note that this request determines the set of requested subscriptions. The actual set of
+   * subscriptions at any given time is the intersection of this set with the set of files currently
+   * subject to analysis. The files currently subject to analysis are the set of files contained
+   * within an actual analysis root but not excluded, plus all of the files transitively reachable
+   * from those files via import, export and part directives. (See analysis.setAnalysisRoots for an
+   * explanation of how the actual analysis roots are determined.) When the actual analysis roots
+   * change, the actual set of subscriptions is automatically updated, but the set of requested
+   * subscriptions is unchanged.
+   *
+   * If a requested subscription is a directory it is ignored, but remains in the set of requested
+   * subscriptions so that if it later becomes a file it can be included in the set of actual
+   * subscriptions.
+   *
+   * It is an error if any of the keys in the map are not valid services. If there is an error, then
+   * the existing subscriptions will remain unchanged.
+   *
+   * @param subscriptions A table mapping services to a list of the files being subscribed to the
+   *         service.
+   */
+  public void flutter_setSubscriptions(Map<String, List<String>> subscriptions);
+
   /**
    * Return {@code true} if the socket is open.
    */