Add interfaces for a new compiler API.

pkg/dart2js_incremental/lib/dart2js_incremental.dart

Index: pkg/dart2js_incremental/lib/dart2js_incremental.dart
diff --git a/pkg/dart2js_incremental/lib/dart2js_incremental.dart b/pkg/dart2js_incremental/lib/dart2js_incremental.dart
index ee04336636b2edb464e8ec907a40f8707e725d65..4971ad6799bd0e2eb7c40057aea2c6e8f14b70ee 100644
--- a/pkg/dart2js_incremental/lib/dart2js_incremental.dart
+++ b/pkg/dart2js_incremental/lib/dart2js_incremental.dart
@@ -14,11 +14,11 @@ import 'dart:profiler' show
 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;
@@ -51,10 +51,10 @@ const List<String> INCREMENTAL_OPTIONS = const <String>[
 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();