Remove dart2js_incremental.

pkg/dart2js_incremental/lib/watcher.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.
-
-library dart2js_incremental.watcher;
-
-import 'dart:io';
-
-import 'dart:async';
-
-class Watcher {
-  final Set<String> _watchedDirectories = new Set<String>();
-
-  final Map<String, Set<Uri>> _watchedFiles = new Map<String, Set<Uri>>();
-
-  final Set<Uri> _changes = new Set<Uri>();
-
-  bool _hasEarlyChanges = false;
-
-  Completer<bool> _changesCompleter;
-
-  Future<bool> hasChanges() {
-    if (_changesCompleter == null && _hasEarlyChanges) {
-      return new Future.value(true);
-    }
-    _changesCompleter = new Completer<bool>();
-    return _changesCompleter.future;
-  }
-
-  void _onFileSystemEvent(FileSystemEvent event) {
-    Set<Uri> uris = _watchedFiles[event.path];
-    if (uris == null) return;
-    _changes.addAll(uris);
-    if (_changesCompleter == null) {
-      _hasEarlyChanges = true;
-    } else if (!_changesCompleter.isCompleted) {
-      _changesCompleter.complete(true);
-    }
-  }
-
-  Map<Uri, Uri> readChanges() {
-    if (_changes.isEmpty) {
-      throw new StateError("No changes");
-    }
-    Map<Uri, Uri> result = new Map<Uri, Uri>();
-    for (Uri uri in _changes) {
-      result[uri] = uri;
-    }
-    _changes.clear();
-    return result;
-  }
-
-  void watchFile(Uri uri) {
-    String realpath = new File.fromUri(uri).resolveSymbolicLinksSync();
-    _watchedFiles.putIfAbsent(realpath, () => new Set<Uri>()).add(uri);
-    Directory directory = new File(realpath).parent;
-    if (_watchedDirectories.add(directory.path)) {
-      print("Watching ${directory.path}");
-      directory.watch().listen(_onFileSystemEvent);
-    }
-  }
-}