Mojo: Move PlatformChannelPair to its own files.

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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'mojo_apps.gypi',
@@ skipping 94 matching lines @@
         'system/message_pipe.cc',
         'system/message_pipe.h',
         'system/message_pipe_dispatcher.cc',
         'system/message_pipe_dispatcher.h',
         'system/message_pipe_endpoint.cc',
         'system/message_pipe_endpoint.h',
         'system/platform_channel.cc',
         'system/platform_channel.h',
         'system/platform_channel_handle.cc',
         'system/platform_channel_handle.h',
-        'system/platform_channel_posix.cc',
+        'system/platform_channel_pair.cc',
+        'system/platform_channel_pair.h',
+        'system/platform_channel_pair_posix.cc',
         'system/proxy_message_pipe_endpoint.cc',
         'system/proxy_message_pipe_endpoint.h',
         'system/raw_channel.h',
         'system/raw_channel_posix.cc',
         'system/raw_channel_win.cc',
         'system/simple_dispatcher.cc',
         'system/simple_dispatcher.h',
         'system/waiter.cc',
         'system/waiter.h',
         'system/waiter_list.cc',
@@ skipping 292 matching lines @@
             'java_in_dir': '<(DEPTH)/mojo/shell/android/apk',
             'resource_dir': '<(DEPTH)/mojo/shell/android/apk/res',
             'native_lib_target': 'libmojo_shell',
           },
           'includes': [ '../build/java_apk.gypi' ],
         }
       ],
     }],
   ],
 }