Start actually adding incrementality into incremental kernel generator.

pkg/front_end/lib/compiler_options.dart

Index: pkg/front_end/lib/compiler_options.dart
diff --git a/pkg/front_end/lib/compiler_options.dart b/pkg/front_end/lib/compiler_options.dart
index 4de445b9dbc4fbaa77b0e33045753c02e6814339..83283fb15562d755239cee2cbcb9770eca19f006 100644
--- a/pkg/front_end/lib/compiler_options.dart
+++ b/pkg/front_end/lib/compiler_options.dart
@@ -5,6 +5,10 @@
 library front_end.compiler_options;
 
 import 'dart:async';
+
+import 'package:front_end/src/base/performace_logger.dart';
+import 'package:front_end/src/incremental/byte_store.dart';
+
 import 'compilation_error.dart';
 import 'file_system.dart';
 import 'physical_file_system.dart';
@@ -103,6 +107,12 @@ class CompilerOptions {
   /// file system.  TODO(paulberry): fix this.
   FileSystem fileSystem = PhysicalFileSystem.instance;
 
+  /// The byte storage to get and put serialized data.
+  ByteStore byteStore = new NullByteStore();
+
+  /// The logger to report compilation progress.
+  PerformanceLog logger = new PerformanceLog(new StringBuffer());
+
   /// Whether to generate code for the SDK when compiling a whole-program.
   bool compileSdk = false;