Add support for SDK outline in IKG.

pkg/front_end/test/src/base/processed_options_test.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/compiler_options.dart';
 import 'package:front_end/memory_file_system.dart';
 import 'package:front_end/src/base/processed_options.dart';
+import 'package:front_end/src/fasta/compiler_context.dart';
 import 'package:front_end/src/fasta/fasta.dart' show ByteSink;
-import 'package:front_end/src/fasta/compiler_context.dart';
 import 'package:front_end/src/fasta/fasta_codes.dart';
 import 'package:kernel/binary/ast_to_binary.dart' show BinaryPrinter;
-import 'package:kernel/kernel.dart' show Program, Library, CanonicalName;
+import 'package:kernel/kernel.dart'
+    show CanonicalName, Library, Program, loadProgramFromBytes;
 import 'package:package_config/packages.dart' show Packages;
-
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 main() {
   CompilerContext.runWithDefaultOptions((_) {
     defineReflectiveSuite(() {
       defineReflectiveTests(ProcessedOptionsTest);
     });
   });
 }
@@ skipping 32 matching lines @@
   }
 
   test_fileSystem_noBazelRoots() {
     // When no bazel roots are specified, the filesystem should be passed
     // through unmodified.
     var raw = new CompilerOptions()..fileSystem = fileSystem;
     var processed = new ProcessedOptions(raw);
     expect(processed.fileSystem, same(fileSystem));
   }
 
+  test_getSdkSummaryBytes_summaryLocationProvided() async {
+    var uri = Uri.parse('file:///sdkSummary');
+
+    writeMockSummaryTo(uri);
+
+    var raw = new CompilerOptions()
+      ..fileSystem = fileSystem
+      ..sdkSummary = uri;
+    var processed = new ProcessedOptions(raw);
+
+    var bytes = await processed.loadSdkSummaryBytes();
+    expect(bytes, isNotEmpty);
+
+    var sdkSummary = loadProgramFromBytes(bytes);
+    expect(sdkSummary.libraries.single.importUri,
+        mockSummary.libraries.single.importUri);
+  }
+
   test_getSdkSummary_summaryLocationProvided() async {
     var uri = Uri.parse('file:///sdkSummary');
     writeMockSummaryTo(uri);
     checkMockSummary(new CompilerOptions()
       ..fileSystem = fileSystem
       ..sdkSummary = uri);
   }
 
   void writeMockSummaryTo(Uri uri) {
     var sink = new ByteSink();
@@ skipping 367 matching lines @@
     var index = messageTemplate.indexOf('#');
     var prefix = messageTemplate.substring(0, index - 1);
 
     // Check that the prefix is not empty and that it contains more than one
     // word.
     expect(prefix.length > 0, isTrue);
     expect(prefix.contains(' '), isTrue);
     return prefix;
   }
 }