Mojo: Abstract out write/writev vs send/sendmsg (for Unix domain sockets).

mojo/mojo.gyp

 # Copyright 2013 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.
 
 {
   'target_defaults': {
     'conditions': [
       ['mojo_shell_debug_url != ""', {
         'defines': [
           'MOJO_SHELL_DEBUG=1',
@@ skipping 93 matching lines @@
       'defines': [
         'MOJO_SYSTEM_IMPL_IMPLEMENTATION',
       ],
       'sources': [
         'embedder/embedder.cc',
         'embedder/embedder.h',
         'embedder/platform_channel_pair.cc',
         'embedder/platform_channel_pair.h',
         'embedder/platform_channel_pair_posix.cc',
         'embedder/platform_channel_pair_win.cc',
+        'embedder/platform_channel_utils_posix.cc',
+        'embedder/platform_channel_utils_posix.h',
         'embedder/platform_handle.cc',
         'embedder/platform_handle.h',
         'embedder/scoped_platform_handle.h',
         'system/channel.cc',
         'system/channel.h',
         'system/constants.h',
         'system/core_impl.cc',
         'system/core_impl.h',
         'system/data_pipe.cc',
         'system/data_pipe.h',
@@ skipping 505 matching lines @@
             'mojo_js_unittests.isolate',
           ],
           'sources': [
             'mojo_js_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }