Add interfaces for a new compiler API.

pkg/dart2js_incremental/lib/dart2js_incremental.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 dart2js_incremental;
 
 import 'dart:async' show
     EventSink,
     Future;
 
 import 'dart:profiler' show
     UserTag;
 
 import 'package:compiler/src/apiimpl.dart' show
     Compiler;
 
-import 'package:compiler/compiler.dart' show
-    CompilerInputProvider,
-    CompilerOutputProvider,
-    Diagnostic,
-    DiagnosticHandler;
+import 'package:compiler/compiler_new.dart' show
+    CompilerDiagnostics,
+    CompilerInput,
+    CompilerOutput,
+    Diagnostic;
 
 import 'package:compiler/src/dart2jslib.dart' show
     NullSink;
 
 import 'package:compiler/src/js_backend/js_backend.dart' show
     JavaScriptBackend;
 
 import 'package:compiler/src/js_emitter/full_emitter/emitter.dart'
     as full show Emitter;
 
@@ skipping 12 matching lines @@
 const List<String> INCREMENTAL_OPTIONS = const <String>[
     '--disable-type-inference',
     '--incremental-support',
     '--generate-code-with-compile-time-errors',
     '--no-source-maps', // TODO(ahe): Remove this.
 ];
 
 class IncrementalCompiler {
   final Uri libraryRoot;
   final Uri packageRoot;
-  final CompilerInputProvider inputProvider;
-  final DiagnosticHandler diagnosticHandler;
+  final CompilerInput inputProvider;
+  final CompilerDiagnostics diagnosticHandler;
   final List<String> options;
-  final CompilerOutputProvider outputProvider;
+  final CompilerOutput outputProvider;
   final Map<String, dynamic> environment;
   final List<String> _updates = <String>[];
   final IncrementalCompilerContext _context = new IncrementalCompilerContext();
 
   Compiler _compiler;
 
   IncrementalCompiler({
       this.libraryRoot,
       this.packageRoot,
       this.inputProvider,
@@ skipping 95 matching lines @@
   }
 }
 
 class IncrementalCompilationFailed {
   final String reason;
 
   const IncrementalCompilationFailed(this.reason);
 
   String toString() => "Can't incrementally compile program.\n\n$reason";
 }