Add interfaces for a new compiler API.

pkg/dart2js_incremental/lib/compiler.dart

 // Copyright (c) 2015, 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.
 
 import 'dart:io';
 
 import 'dart:async' show
     EventSink,
     Future,
     Stream,
     StreamController,
     StreamSubscription;
 
 import 'package:dart2js_incremental/dart2js_incremental.dart' show
     IncrementalCompilationFailed,
     IncrementalCompiler;
 
+import 'package:compiler/compiler_new.dart' show
+    CompilerOutput;
+
+import 'package:compiler/src/old_to_new_api.dart' show
+    LegacyCompilerDiagnostics,
+    LegacyCompilerInput;
+
 import 'package:compiler/src/source_file_provider.dart' show
     FormattingDiagnosticHandler;
 
 import 'watcher.dart';
 
 main(List<String> arguments) {
   int updateCount = 0;
   StreamSubscription<CompilerEvent> subscription =
       compile(Uri.base.resolve(arguments.first)).listen(null);
   subscription.onData((CompilerEvent event) {
@@ skipping 69 matching lines @@
       }
     }
     return diagnosticHandler.provider(uri);
   }
 
   while (true) {
     Stopwatch sw = new Stopwatch()..start();
     IncrementalCompiler compiler = new IncrementalCompiler(
         libraryRoot: libraryRoot,
         packageRoot: packageRoot,
-        inputProvider: inputProvider,
-        diagnosticHandler: resilientDiagnosticHandler,
+        inputProvider: new LegacyCompilerInput(inputProvider),
+        diagnosticHandler:
+            new LegacyCompilerDiagnostics(resilientDiagnosticHandler),
         outputProvider: outputProvider);
 
     bool success = await compiler.compile(originalInput);
     sw.stop();
     if (success) {
       controller.add(
           new CompilerEvent(
               IncrementalKind.FULL, compiler, outputProvider.output, sw));
     } else {
       controller.add(
@@ skipping 16 matching lines @@
 
       } on IncrementalCompilationFailed catch (error, trace) {
         controller.addError(error, trace);
         break;
       }
     }
   }
 }
 
 /// Output provider which collects output in [output].
-class OutputProvider {
+class OutputProvider implements CompilerOutput {
   final Map<String, String> output = new Map<String, String>();
 
-  EventSink<String> call(String name, String extension) {
+  EventSink<String> createSink(String name, String extension) {
     return new StringEventSink((String data) {
       output['$name.$extension'] = data;
     });
   }
 
   String operator[](String key) => output[key];
 }
 
 /// Helper class to collect sources.
 class StringEventSink implements EventSink<String> {
@@ skipping 35 matching lines @@
 
   final Stopwatch stopwatch;
 
   final String updates;
 
   CompilerEvent(
       this.kind, this.compiler, this._output, this.stopwatch, {this.updates});
 
   String operator[](String key) => _output[key];
 }