platform-window: Add a PlatformWindowFactory for creating windows.

mojo/mojo_services.gypi

 # Copyright (c) 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.
 
 {
   'targets': [
     {
       # GN version: //mojo/services/dbus_echo:bindings
       'target_name': 'mojo_echo_bindings',
       'type': 'static_library',
@@ skipping 293 matching lines @@
         'mojo_native_viewport_bindings',
         '<(mojo_system_for_component)',
       ],
       'defines': [
         'MOJO_NATIVE_VIEWPORT_IMPLEMENTATION',
       ],
       'sources': [
         'services/native_viewport/native_viewport.h',
         'services/native_viewport/native_viewport_android.cc',
         'services/native_viewport/native_viewport_mac.mm',
-        'services/native_viewport/native_viewport_ozone.cc',
         'services/native_viewport/native_viewport_service.cc',
         'services/native_viewport/native_viewport_service.h',
         'services/native_viewport/native_viewport_stub.cc',
-        'services/native_viewport/native_viewport_win.cc',
-        'services/native_viewport/native_viewport_x11.cc',
+        'services/native_viewport/platform_viewport.cc',
       ],
       'conditions': [
         ['OS=="win" or OS=="android" or OS=="linux" or OS=="mac"', {
           'sources!': [
             'services/native_viewport/native_viewport_stub.cc',
           ],
         }],
         ['OS=="android"', {
           'dependencies': [
             'mojo_jni_headers',
           ],
         }],
+        ['use_x11==1 or use_ozone==1 or OS=="win"', {
+          'dependencies': [
+            '../ui/platform_window/platform_window.gyp:platform_window',
+          ],
+        }, {
+          'sources!': [
+            'services/native_viewport/platform_viewport.cc',
+          ],
+        }],
         ['OS=="win"', {
           'dependencies': [
             '../ui/platform_window/win/win_window.gyp:win_window',
           ],
         }],
         ['use_x11==1', {
           'dependencies': [
             '../ui/platform_window/x11/x11_window.gyp:x11_window',
           ],
         }],
@@ skipping 529 matching lines @@
             'mojo_system_impl',
           ],
           'sources': [
             'services/dbus_echo/dbus_echo_service.cc',
           ],
         },
       ],
     }],
   ],
 }