Add support for SDK outline in IKG.

pkg/front_end/lib/src/incremental_kernel_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:front_end/incremental_kernel_generator.dart';
 import 'package:front_end/src/base/performace_logger.dart';
 import 'package:front_end/src/base/processed_options.dart';
 import 'package:front_end/src/fasta/uri_translator.dart';
@@ skipping 15 matching lines @@
 
   /// The logger to report compilation progress.
   final PerformanceLog _logger;
 
   /// The URI of the program entry point.
   final Uri _entryPoint;
 
   /// The function to notify when files become used or unused, or `null`.
   final WatchUsedFilesFn _watchFn;
 
-  /// TODO(scheglov) document
+  /// The [KernelDriver] that is used to compute kernels.
   KernelDriver _driver;
 
   /// Latest compilation signatures produced by [computeDelta] for libraries.
   final Map<Uri, String> _latestSignature = {};
 
   /// The object that provides additional information for tests.
   _TestView _testView;
 
-  IncrementalKernelGeneratorImpl(
-      ProcessedOptions options, UriTranslator uriTranslator, this._entryPoint,
+  IncrementalKernelGeneratorImpl(ProcessedOptions options,
+      UriTranslator uriTranslator, List<int> sdkOutlineBytes, this._entryPoint,
       {WatchUsedFilesFn watch})
       : _logger = options.logger,
         _watchFn = watch {
     _testView = new _TestView(this);
 
     Future<Null> onFileAdded(Uri uri) {
       if (_watchFn != null) {
         return _watchFn(uri, true);
       }
       return new Future.value();
     }
 
-    _driver =
-        new KernelDriver(options, uriTranslator, fileAddedFn: onFileAdded);
+    _driver = new KernelDriver(options, uriTranslator,
+        sdkOutlineBytes: sdkOutlineBytes, fileAddedFn: onFileAdded);
   }
 
   /// Return the object that provides additional information for tests.
   @visibleForTesting
   _TestView get test => _testView;
 
   @override
   Future<DeltaProgram> computeDelta() async {
     return await _logger.runAsync('Compute delta', () async {
       KernelResult kernelResult = await _driver.getKernel(_entryPoint);
@@ skipping 72 matching lines @@
 
 @visibleForTesting
 class _TestView {
   final IncrementalKernelGeneratorImpl _generator;
 
   _TestView(this._generator);
 
   /// The [KernelDriver] that is used to actually compile.
   KernelDriver get driver => _generator._driver;
 }