Fixes to patch files necessary to use the analyzer

runtime/bin/file_patch.dart

Index: runtime/bin/file_patch.dart
diff --git a/runtime/bin/file_patch.dart b/runtime/bin/file_patch.dart
index 2fe1414fa9950d6a9d07034b5ae8b8f546ae9bfc..5e4b16a0319ae568afd8ef599b93b46f2c09751e 100644
--- a/runtime/bin/file_patch.dart
+++ b/runtime/bin/file_patch.dart
@@ -77,14 +77,14 @@ class _WatcherPath {
   @patch static Stream<FileSystemEvent> _watch(
       String path, int events, bool recursive) {
     if (Platform.isLinux) {
-      return new _InotifyFileSystemWatcher(path, events, recursive).stream;
+      return new _InotifyFileSystemWatcher(path, events, recursive)._stream;
     }
     if (Platform.isWindows) {
-      return new _Win32FileSystemWatcher(path, events, recursive).stream;
+      return new _Win32FileSystemWatcher(path, events, recursive)._stream;
     }
     if (Platform.isMacOS) {
       return new _FSEventStreamFileSystemWatcher(
-          path, events, recursive).stream;
+          path, events, recursive)._stream;
     }
     throw new FileSystemException(
         "File system watching is not supported on this platform");
@@ -100,7 +100,7 @@ class _WatcherPath {
                                                           onCancel: _cancel);
   }
 
-  Stream get stream => _broadcastController.stream;
+  Stream get _stream => _broadcastController.stream;

[Kevin Millikin (Google), 2017/01/04 15:31:04]

Patch files can't introduce new public members, so this one is made private
(like all the other members introduced in this class).

1. It might be possible to relax the restriction, so that patch files can add
public members to private classes.  That doesn't seem worth it for this single
use case.

2. This whole class has two public static members which have one call site each,
and both throw because they're unsupported on dart2js.  I think it would be
possible to patch the functions that call this class's members instead, and move
this entire class into the patch file (in which case you could introduce all the
public members you wanted).

 
   void _listen() {
     if (_id == null) {