Add 'isDir' to FileSystemEvent.

runtime/bin/file_system_watcher_linux.cc

 // Copyright (c) 2013, 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.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "bin/file_system_watcher.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 53 matching lines @@
     struct inotify_event* e =
         reinterpret_cast<struct inotify_event*>(buffer + offset);
     Dart_Handle event = Dart_NewList(4);
     int mask = 0;
     if (e->mask & IN_MODIFY) mask |= kModifyContent;
     if (e->mask & IN_ATTRIB) mask |= kModefyAttribute;
     if (e->mask & IN_CREATE) mask |= kCreate;
     if (e->mask & IN_MOVE) mask |= kMove;
     if (e->mask & IN_DELETE) mask |= kDelete;
     if (e->mask & IN_DELETE_SELF) mask |= kDeleteSelf;
+    if (e->mask & IN_ISDIR) mask |= kIsDir;
     Dart_ListSetAt(event, 0, Dart_NewInteger(mask));
     Dart_ListSetAt(event, 1, Dart_NewInteger(e->cookie));
     if (e->len > 0) {
       Dart_ListSetAt(event, 2, Dart_NewStringFromUTF8(
           reinterpret_cast<uint8_t*>(e->name), strlen(e->name)));
     } else {
       Dart_ListSetAt(event, 2, Dart_Null());
     }
     Dart_ListSetAt(event, 3, Dart_NewBoolean(e->mask & IN_MOVED_TO));
     Dart_ListSetAt(events, i, event);
     i++;
     offset += kEventSize + e->len;
   }
   ASSERT(offset == bytes);
   return events;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)