Allow Analysis Server crawl up the folders to search .analysis_options file.

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 'dart:convert';
 import 'dart:core' hide Resource;
@@ skipping 619 matching lines @@
     }
 
     // Set ignore patterns.
     YamlList exclude = analyzer[AnalyzerOptions.exclude];
     if (exclude != null) {
       setIgnorePatternsForContext(info, exclude);
     }
   }
 
   /**
-   * Return the options from the analysis options file in the given [folder], or
-   * `null` if there is no file in the folder or if the contents of the file are
-   * not valid YAML.
+   * Return the options from the analysis options file in the given [folder]
+   * if exists, or in one of the parent folders, or `null` if no analysis
+   * options file is found or if the contents of the file are not valid YAML.
    */
   Map<String, Object> readOptions(Folder folder) {
     try {
-      return analysisOptionsProvider.getOptions(folder);
+      return analysisOptionsProvider.getOptions(folder, crawlUp: true);
     } catch (_) {
       // Parse errors are reported by GenerateOptionsErrorsTask.
     }
     return null;
   }
 
   @override
   void refresh(List<Resource> roots) {
     // Destroy old contexts
     List<ContextInfo> contextInfos = rootInfo.descendants.toList();
@@ skipping 1102 matching lines @@
       ResourceProvider resourceProvider) {
     if (packages != null) {
       // Construct package map for the SdkExtUriResolver.
       Map<String, List<Folder>> packageMap = buildPackageMap(resourceProvider);
       return <UriResolver>[new SdkExtUriResolver(packageMap)];
     } else {
       return const <UriResolver>[];
     }
   }
 }