First end-to-end capability in analyzer2dart.

pkg/analyzer2dart/lib/src/driver.dart

 // Copyright (c) 2014, 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 analyzer2dart.driver;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 
+import 'package:compiler/compiler.dart';
+
 import 'closed_world.dart';
 import 'tree_shaker.dart';
 
 /**
  * Top level driver for Analyzer2Dart.
  */
 class Driver {
   final ResourceProvider resourceProvider;
   final AnalysisContext context;
+  final CompilerOutputProvider outputProvider;
 
-  Driver(this.resourceProvider, DartSdk sdk)
+  Driver(this.resourceProvider, DartSdk sdk, this.outputProvider)
       : context = AnalysisEngine.instance.createAnalysisContext() {
     // Set up the source factory.
     // TODO(paulberry): do we want to use ExplicitPackageUriResolver?
     List<UriResolver> uriResolvers = [
         new FileUriResolver(),
         new DartUriResolver(sdk) /* ,
         new PackageUriResolver(packagesDirectories) */
     ];
     context.sourceFactory = new SourceFactory(uriResolvers);
   }
 
   /**
    * Compute the closed world that is reachable from an entry point.
    */
   ClosedWorld computeWorld(FunctionElement entryPointElement) {
-    TreeShaker treeShaker = new TreeShaker();
-    treeShaker.addElement(entryPointElement);
+    TreeShaker treeShaker = new TreeShaker(entryPointElement);
     return treeShaker.shake();
   }
 
   /**
    * Given a source, resolve it and return its entry point.
    */
   FunctionElement resolveEntryPoint(Source source) {
     // Get the library element associated with the source.
     LibraryElement libraryElement = context.computeLibraryElement(source);
 
@@ skipping 13 matching lines @@
     File file = resourceProvider.getResource(path);
     Source source = file.createSource();
     // add the Source
     ChangeSet changeSet = new ChangeSet();
     changeSet.addedSource(source);
     context.applyChanges(changeSet);
     // return the Source
     return source;
   }
 }