Revert "Use single InputPackagesResultProvider, without SdkSummaryResultProvider."

pkg/front_end/lib/src/incremental_resolved_ast_generator_impl.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/dart/analysis/byte_store.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart' as driver;
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:analyzer/src/summary/idl.dart';
+import 'package:analyzer/src/summary/summary_sdk.dart';
 import 'package:analyzer/src/util/absolute_path.dart';
 import 'package:front_end/incremental_resolved_ast_generator.dart';
 import 'package:front_end/src/base/file_repository.dart';
 import 'package:front_end/src/base/processed_options.dart';
 import 'package:front_end/src/base/source.dart';
 import 'package:front_end/src/dependency_grapher_impl.dart';
 import 'package:path/src/context.dart';
 
 dynamic unimplemented() {
   // TODO(paulberry): get rid of this.
@@ skipping 88 matching lines @@
     // TODO(paulberry): MemoryByteStore leaks memory (it never discards data).
     // Do something better here.
     var byteStore = new MemoryByteStore();
     // TODO(paulberry): can we just use null?
     var fileContentOverlay = new FileContentOverlay();
     var sdkContext = new AnalysisContextImpl();
     var dartSdk = new _DartSdkProxy(
         await _options.getSdkSummary(), sdkContext, _fileRepository);
     sdkContext.sourceFactory =
         new SourceFactory([new DartUriResolver(dartSdk)]);
+    bool strongMode = true; // TODO(paulberry): support strong mode flag.
+    sdkContext.resultProvider = new SdkSummaryResultProvider(
+        sdkContext, await _options.getSdkSummary(), strongMode);
 
     var sourceFactory = new _SourceFactoryProxy(dartSdk, _fileRepository);
     var analysisOptions = new AnalysisOptionsImpl();
     _driver = new driver.AnalysisDriver(
         _scheduler,
         performanceLog,
         _resourceProvider,
         byteStore,
         fileContentOverlay,
         'front_end',
@@ skipping 124 matching lines @@
   AnalysisContext context;
 
   _SourceFactoryProxy(this.dartSdk, this._fileRepository);
 
   @override
   SourceFactory clone() => new _SourceFactoryProxy(dartSdk, _fileRepository);
 
   @override
   Source forUri(String absoluteUri) {
     Uri uri = Uri.parse(absoluteUri);
-    if (uri.scheme == 'dart') {
-      return new _SourceProxy(
-          uri, _fileRepository.pathForUri(uri, allocate: true));
-    }
     return new _SourceProxy(uri, _fileRepository.pathForUri(uri));
   }
 
   noSuchMethod(Invocation invocation) => unimplemented();
 
   Source resolveUri(Source containingSource, String containedUri) {
     // TODO(paulberry): re-use code from dependency_grapher_impl, and support
     // SDK URI resolution logic.
-    String absoluteUri =
-        resolveRelativeUri(containingSource?.uri, Uri.parse(containedUri))
-            .toString();
+    var absoluteUri = containingSource == null
+        ? containedUri
+        : containingSource.uri.resolve(containedUri).toString();
     return forUri(absoluteUri);
   }
 
   @override
   Uri restoreUri(Source source) => source.uri;
 }
 
 class _SourceProxy extends BasicSource {
   @override
   final String fullName;
 
   _SourceProxy(Uri uri, this.fullName) : super(uri);
 
   int get modificationStamp => 0;
 
   noSuchMethod(Invocation invocation) => unimplemented();
 }