Add MultiSourceInformationStrategy

pkg/compiler/lib/src/compiler.dart

 // Copyright (c) 2012, 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.compiler_base;
 
 import 'dart:async' show EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'closure.dart' as closureMapping show ClosureTask;
@@ skipping 249 matching lines @@
     tasks.addAll(backend.tasks);
   }
 
   /// Creates the backend.
   ///
   /// Override this to mock the backend for testing.
   js_backend.JavaScriptBackend createBackend() {
     return new js_backend.JavaScriptBackend(this,
         generateSourceMap: options.generateSourceMap,
         useStartupEmitter: options.useStartupEmitter,
+        useMultiSourceInfo: options.useMultiSourceInfo,
         useNewSourceInfo: options.useNewSourceInfo,
         useKernel: options.useKernel);
   }
 
   /// Creates the scanner task.
   ///
   /// Override this to mock the scanner for testing.
   ScannerTask createScannerTask() =>
       new ScannerTask(dietParser, reporter, measurer,
           preserveComments: options.preserveComments, commentMap: commentMap);
@@ skipping 1789 matching lines @@
     if (library != null && library.isSynthesized) {
       return null;
     }
     if (library == null && required) {
       throw new SpannableAssertionFailure(
           library, "The library '${uri}' was not found.");
     }
     return library;
   }
 }