Fix Analysis Engine plugin setup.

lib/src/driver.dart

 // Copyright (c) 2015, 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 analyzer_cli.src.driver;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
@@ skipping 350 matching lines @@
       return;
     }
     _previousOptions = options;
     // Choose a package resolution policy and a diet parsing policy based on
     // the command-line options.
     SourceFactory sourceFactory = _chooseUriResolutionPolicy(options);
     AnalyzeFunctionBodiesPredicate dietParsingPolicy =
         _chooseDietParsingPolicy(options);
     // Create a context using these policies.
     AnalysisContext context = AnalysisEngine.instance.createAnalysisContext();
+
     context.sourceFactory = sourceFactory;
 
     if (options.strongMode) {
       // TODO(jmesserly): support options file
       var strongOptions = new StrongModeOptions(hints: options.strongHints);
       // TODO(jmesserly): make StrongChecker an analysis plugin
       _strongChecker = new StrongChecker(context, strongOptions);
     }
 
     Map<String, String> definedVariables = options.definedVariables;
@@ skipping 67 matching lines @@
       optionsProcessors
           .forEach((OptionsProcessor p) => p.optionsProcessed(options));
     } on Exception catch (e) {
       optionsProcessors.forEach((OptionsProcessor p) => p.onError(e));
     }
   }
 
   void _processPlugins() {
     List<Plugin> plugins = <Plugin>[];
     plugins.add(linterPlugin);
-    plugins.addAll(AnalysisEngine.instance.supportedPlugins);
     plugins.addAll(_userDefinedPlugins);
-    ExtensionManager manager = new ExtensionManager();
-    manager.processPlugins(plugins);
+    AnalysisEngine.instance.userDefinedPlugins = plugins;
+
+    // This ensures that AE extension manager processes plugins.
+    AnalysisEngine.instance.taskManager;
   }
 
   /// Analyze a single source.
   ErrorSeverity _runAnalyzer(Source source, CommandLineOptions options) {
     int startTime = currentTimeMillis();
     AnalyzerImpl analyzer =
         new AnalyzerImpl(_context, _strongChecker, source, options, startTime);
     var errorSeverity = analyzer.analyzeSync();
     if (errorSeverity == ErrorSeverity.ERROR) {
       exitCode = errorSeverity.ordinal;
@@ skipping 114 matching lines @@
     for (var package in packages) {
       var packageName = path.basename(package.path);
       var realPath = package.resolveSymbolicLinksSync();
       result[packageName] = [
         PhysicalResourceProvider.INSTANCE.getFolder(realPath)
       ];
     }
     return result;
   }
 }