Add interfaces for a new compiler API.

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 Future, EventSink;
 import 'dart:convert' show UTF8, LineSplitter;
 import 'dart:io'
@@ skipping 484 matching lines @@
   if (uri.scheme != 'file') {
     fail('Unhandled scheme ${uri.scheme}.');
   }
   var file = new File(uri.toFilePath()).openSync(mode: FileMode.WRITE);
   file.writeStringSync(text);
   file.closeSync();
 }
 
 void fail(String message) {
   if (diagnosticHandler != null) {
-    diagnosticHandler.diagnosticHandler(
+    diagnosticHandler.report(
         null, -1, -1, message, api.Diagnostic.ERROR);
   } else {
     print('Error: $message');
   }
   exitFunc(1);
 }
 
 Future<api.CompilationResult> compilerMain(List<String> arguments) {
   var root = uriPathToNative("/$LIBRARY_ROOT");
   arguments = <String>['--library-root=${Platform.script.toFilePath()}$root']
@@ skipping 249 matching lines @@
       } else if (exitCode == 253) {
         print(">>> TEST CRASH");
       } else {
         print(">>> TEST FAIL");
       }
       stderr.writeln(">>> EOF STDERR");
       subscription.resume();
     });
   });
 }