Issue 23640. Implement 'analysis.getNavigation' request.

pkg/analysis_server/tool/spec/generated/java/types/RequestErrorCode.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 29 matching lines @@
    */
   public static final String FORMAT_WITH_ERRORS = "FORMAT_WITH_ERRORS";
 
   /**
    * An "analysis.getErrors" request specified a FilePath which does not match a file currently
    * subject to analysis.
    */
   public static final String GET_ERRORS_INVALID_FILE = "GET_ERRORS_INVALID_FILE";
 
   /**
+   * An "analysis.getErrors" request specified a FilePath which does not match a file currently
+   * subject to analysis.
+   */
+  public static final String GET_NAVIGATION_INVALID_FILE = "GET_NAVIGATION_INVALID_FILE";
+
+  /**
    * A path passed as an argument to a request (such as analysis.reanalyze) is required to be an
    * analysis root, but isn't.
    */
   public static final String INVALID_ANALYSIS_ROOT = "INVALID_ANALYSIS_ROOT";
 
   /**
    * The context root used to create an execution context does not exist.
    */
   public static final String INVALID_EXECUTION_CONTEXT = "INVALID_EXECUTION_CONTEXT";
 
@@ skipping 67 matching lines @@
   public static final String UNKNOWN_SOURCE = "UNKNOWN_SOURCE";
 
   /**
    * The analysis server was requested to perform an action which is not supported.
    *
    * This is a legacy error; it will be removed before the API reaches version 1.0.
    */
   public static final String UNSUPPORTED_FEATURE = "UNSUPPORTED_FEATURE";
 
 }