Add context information to driver and add hooks for plugin management

pkg/analysis_server/test/context_manager_test.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 test.context.directory.manager;
 
 import 'dart:collection';
 
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analysis_server/src/utilities/null_string_sink.dart';
+import 'package:analyzer/context/context_root.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:analyzer/source/error_processor.dart';
 import 'package:analyzer/src/context/builder.dart';
 import 'package:analyzer/src/dart/analysis/byte_store.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/error/codes.dart';
@@ skipping 2678 matching lines @@
   }
 
   /**
    * Return the current source factory.
    */
   SourceFactory get sourceFactory => currentDriver == null
       ? currentContext.sourceFactory
       : currentDriver.sourceFactory;
 
   @override
-  AnalysisDriver addAnalysisDriver(Folder folder, AnalysisOptions options) {
+  AnalysisDriver addAnalysisDriver(
+      Folder folder, ContextRoot contextRoot, AnalysisOptions options) {
     String path = folder.path;
     expect(currentContextRoots, isNot(contains(path)));
+    expect(contextRoot, isNotNull);
+    expect(contextRoot.root, path);
     currentContextTimestamps[path] = now;
 
     ContextBuilder builder =
         createContextBuilder(folder, options, useSummaries: true);
     AnalysisContext context = builder.buildContext(folder.path);
     SourceFactory sourceFactory = context.sourceFactory;
     AnalysisOptions analysisOptions = context.analysisOptions;
     context.dispose();
 
     currentDriver = new AnalysisDriver(
         scheduler,
         logger,
         resourceProvider,
         new MemoryByteStore(),
         new FileContentOverlay(),
-        path,
+        contextRoot,
         sourceFactory,
         analysisOptions);
     driverMap[path] = currentDriver;
     currentDriver.exceptions.listen((ExceptionResult result) {
       AnalysisEngine.instance.logger
           .logError('Analysis failed: ${result.path}', result.exception);
     });
     return currentDriver;
   }
 
@@ skipping 158 matching lines @@
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }