Rewire DDC to use the analyzer task model

lib/src/analysis_context.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 dev_compiler.src.analysis_context;
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_io.dart' show JavaFile;
 import 'package:analyzer/src/generated/sdk_io.dart' show DirectoryBasedDartSdk;
 import 'package:analyzer/src/generated/source.dart' show DartUriResolver;
@@ skipping 11 matching lines @@
 AnalysisContext createAnalysisContextWithSources(
     StrongModeOptions strongOptions, SourceResolverOptions srcOptions,
     {DartUriResolver sdkResolver, List<UriResolver> fileResolvers}) {
   var srcFactory = createSourceFactory(srcOptions,
       sdkResolver: sdkResolver, fileResolvers: fileResolvers);
   return createAnalysisContext(strongOptions)..sourceFactory = srcFactory;
 }
 
 /// Creates an analysis context that contains our restricted typing rules.
 AnalysisContext createAnalysisContext(StrongModeOptions options) {
-  AnalysisContextImpl res = AnalysisEngine.instance.createAnalysisContext();
-  enableDevCompilerInference(res, options);
+  AnalysisEngine.instance.useTaskModel = true;
+  var res = AnalysisEngine.instance.createAnalysisContext();
+  res.analysisOptions.strongMode = true;
+  if (!AnalysisEngine.instance.useTaskModel) enableDevCompilerInference(res, options);
   return res;
 }
 
 /// Enables dev_compiler inference rules.
 // TODO(jmesserly): is there a cleaner way to plug this in?
 void enableDevCompilerInference(
     AnalysisContextImpl context, StrongModeOptions options) {
   context.libraryResolverFactory = (c) =>
       new LibraryResolverWithInference(c, options);
 }
@@ skipping 31 matching lines @@
 }
 
 /// Creates a [DartUriResolver] that uses a mock 'dart:' library contents.
 DartUriResolver createMockSdkResolver(Map<String, String> mockSources) =>
     new MockDartSdk(mockSources, reportMissing: true).resolver;
 
 /// Creates a [DartUriResolver] that uses the SDK at the given [sdkPath].
 DartUriResolver createSdkPathResolver(String sdkPath) =>
     new DartUriResolver(new DirectoryBasedDartSdk(
         new JavaFile(sdkPath), /*useDart2jsPaths:*/ true));