Dart: Simplifies the handle watcher. Various cleanups and bugfixes.

mojo/public/dart/src/buffer.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 part of core;
 
 class _MojoSharedBufferNatives {
   static List Create(int num_bytes, int flags)
       native "MojoSharedBuffer_Create";
 
@@ skipping 10 matching lines @@
   static int Unmap(ByteData buffer)
       native "MojoSharedBuffer_Unmap";
 }
 
 
 class MojoSharedBuffer {
   static const int CREATE_FLAG_NONE = 0;
   static const int DUPLICATE_FLAG_NONE = 0;
   static const int MAP_FLAG_NONE = 0;
 
-  RawMojoHandle handle;
+  MojoHandle handle;
   MojoResult status;
   ByteData mapping;
 
   MojoSharedBuffer._() {
     handle = null;
     status = MojoResult.OK;
     mapping = null;
   }
 
   factory MojoSharedBuffer(int num_bytes, [int flags = 0]) {
     List result = _MojoSharedBufferNatives.Create(num_bytes, flags);
     if (result == null) {
       return null;
     }
     assert((result is List) && (result.length == 2));
     var r = new MojoResult(result[0]);
     if (!r.isOk) {
       return null;
     }
 
     MojoSharedBuffer buf = new MojoSharedBuffer._();
     buf.status = r;
-    buf.handle = new RawMojoHandle(result[1]);
+    buf.handle = new MojoHandle(result[1]);
     buf.mapping = null;
     return buf;
   }
 
   factory MojoSharedBuffer.duplicate(MojoSharedBuffer msb, [int flags = 0]) {
     List result = _MojoSharedBufferNatives.Duplicate(msb.handle.h, flags);
     if (result == null) {
       return null;
     }
     assert((result is List) && (result.length == 2));
     var r = new MojoResult(result[0]);
     if(!r.isOk) {
       return null;
     }
 
     MojoSharedBuffer dupe = new MojoSharedBuffer._();
     dupe.status = r;
-    dupe.handle = new RawMojoHandle(result[1]);
+    dupe.handle = new MojoHandle(result[1]);
     dupe.mapping = null;  // The buffer is not mapped in the duplicate.
     return dupe;
   }
 
   MojoResult close() {
     if (handle == null) {
       status = MojoResult.INVALID_ARGUMENT;
       return status;
     }
     MojoResult r = handle.close();
@@ skipping 19 matching lines @@
     return status;
   }
 
   MojoResult unmap() {
     int r = _MojoSharedBufferNatives.Unmap(mapping);
     status = new MojoResult(r);
     mapping = null;
     return status;
   }
 }