Add MultiSourceInformationStrategy

pkg/compiler/lib/src/dart2js.dart

 // Copyright (c) 2013, 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 dart2js.cmdline;
 
 import 'dart:async' show EventSink, Future;
 import 'dart:convert' show UTF8, LineSplitter;
 import 'dart:io' show exit, File, FileMode, Platform, stdin, stderr;
 
@@ skipping 377 matching lines @@
     new OptionHandler('--enable-null-aware-operators', (_) {
       hints.add("Option '--enable-null-aware-operators' is no longer needed. "
           "Null aware operators are supported by default.");
     }),
     new OptionHandler('--enable-enum', (_) {
       hints.add("Option '--enable-enum' is no longer needed. "
           "Enums are supported by default.");
     }),
     new OptionHandler(Flags.allowNativeExtensions, setAllowNativeExtensions),
     new OptionHandler(Flags.generateCodeWithCompileTimeErrors, passThrough),
+    new OptionHandler(Flags.useMultiSourceInfo, passThrough),
     new OptionHandler(Flags.useNewSourceInfo, passThrough),
     new OptionHandler(Flags.testMode, passThrough),
 
     // The following three options must come last.
     new OptionHandler('-D.+=.*', addInEnvironment),
     new OptionHandler('-.*', (String argument) {
       helpAndFail("Unknown option '$argument'.");
     }),
     new OptionHandler('.*', (String argument) {
       arguments.add(nativeToUriPath(argument));
@@ skipping 619 matching lines @@
   @override
   void add(String event) {
     sb.write(event);
   }
 
   @override
   void close() {
     // Do nothing.
   }
 }