Add FileSystemWatcher class to dart:io.

runtime/bin/eventhandler_win.h

 // Copyright (c) 2012, 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.
 
 #ifndef BIN_EVENTHANDLER_WIN_H_
 #define BIN_EVENTHANDLER_WIN_H_
 
 #if !defined(BIN_EVENTHANDLER_H_)
 #error Do not include eventhandler_win.h directly; use eventhandler.h instead.
 #endif
@@ skipping 112 matching lines @@
   // object as the object is allocated larger than it's definition
   // indicate to extend this array.
   uint8_t buffer_data_[1];
 };
 
 
 // Abstract super class for holding information on listen and connected
 // sockets.
 class Handle {
  public:
-  enum Type { kFile, kClientSocket, kListenSocket };
+  enum Type {
+    kFile,
+    kDirectoryWatch,
+    kClientSocket,
+    kListenSocket
+  };
 
   class ScopedLock {
    public:
     explicit ScopedLock(Handle* handle)
         : handle_(handle) {
       handle_->Lock();
     }
     ~ScopedLock() {
       handle_->Unlock();
     }
@@ skipping 105 matching lines @@
       : Handle(reinterpret_cast<HANDLE>(handle)) { type_ = kFile; }
   FileHandle(HANDLE handle, Dart_Port port)
       : Handle(reinterpret_cast<HANDLE>(handle), port) { type_ = kFile; }
 
   virtual void EnsureInitialized(EventHandlerImplementation* event_handler);
   virtual bool IsClosed();
   virtual void DoClose();
 };
 
 
+class DirectoryWatchHandle : public Handle {
+ public:
+  DirectoryWatchHandle(HANDLE handle, int events, bool recursive)
+      : Handle(reinterpret_cast<HANDLE>(handle)),

[Søren Gjesse, 2013/08/26 07:51:55]

I don't think this case is needed here. Handle takes a HANDLE.

+        events_(events),
+        recursive_(recursive) {
+    type_ = kDirectoryWatch;
+  }
+
+  virtual void EnsureInitialized(EventHandlerImplementation* event_handler);
+  virtual bool IsClosed();
+  virtual void DoClose();
+
+  virtual bool IssueRead();
+
+ private:
+  int events_;
+  bool recursive_;
+};
+
+
 class SocketHandle : public Handle {
  public:
   SOCKET socket() { return reinterpret_cast<SOCKET>(handle_); }
 
  protected:
   explicit SocketHandle(SOCKET s) : Handle(reinterpret_cast<HANDLE>(s)) {}
   SocketHandle(SOCKET s, Dart_Port port)
       : Handle(reinterpret_cast<HANDLE>(s), port) {}
 
   virtual void HandleIssueError();
@@ skipping 124 matching lines @@
 
   TimeoutQueue timeout_queue_;  // Time for next timeout.
   bool shutdown_;
   HANDLE completion_port_;
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_EVENTHANDLER_WIN_H_