Add a "native_support" service.

apps/moterm/moterm_driver.cc

 // Copyright 2015 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.
 
 #include "apps/moterm/moterm_driver.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/logging.h"
@@ skipping 169 matching lines @@
   client_->OnDataReceived(translated_bytes.data(),
                           static_cast<uint32_t>(translated_bytes.size()));
 }
 
 void MotermDriver::Close(const CloseCallback& callback) {
   if (is_closed_) {
     callback.Run(mojo::files::ERROR_CLOSED);
     return;
   }
 
+  // TODO(vtl): Call pending read callbacks?
+
   is_closed_ = true;
   callback.Run(mojo::files::ERROR_OK);
 
-  // TODO(vtl): Call pending read callbacks?
-
   client_->OnClosed();
 }
 
 void MotermDriver::Read(uint32_t num_bytes_to_read,
                         int64_t offset,
                         mojo::files::Whence whence,
                         const ReadCallback& callback) {
   if (is_closed_) {
     callback.Run(mojo::files::ERROR_CLOSED, mojo::Array<uint8_t>());
     return;
@@ skipping 277 matching lines @@
   }
   if (1 + kVEOFIdx < in_values.size()) {
     uint32_t value = in_values[1 + kVEOFIdx];
     if (value > std::numeric_limits<uint8_t>::max())
       return mojo::files::ERROR_INVALID_ARGUMENT;
     veof_ = static_cast<uint8_t>(value);
   }
 
   return mojo::files::ERROR_OK;
 }