aura: Unify WindowTreeHost for some platforms

ui/aura/aura.gyp

 # Copyright (c) 2012 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,
   },
   'targets': [
     {
@@ skipping 90 matching lines @@
         'window_observer.h',
         'window_targeter.cc',
         'window_targeter.h',
         'window_tracker.cc',
         'window_tracker.h',
         'window_tree_host.cc',
         'window_tree_host.h',
         'window_tree_host_mac.h',
         'window_tree_host_mac.mm',
         'window_tree_host_observer.h',
-        'window_tree_host_ozone.cc',
-        'window_tree_host_ozone.h',
-        'window_tree_host_win.cc',
-        'window_tree_host_win.h',
         'window_tree_host_x11.cc',
         'window_tree_host_x11.h',
       ],
       'conditions': [
         ['use_x11==1', {
           'dependencies': [
             '../../build/linux/system.gyp:x11',
             '../../build/linux/system.gyp:xrandr',
             '../../build/linux/system.gyp:xi',
             '../events/devices/events_devices.gyp:events_devices',
@@ skipping 10 matching lines @@
           'sources!': [
             'input_state_lookup.cc',
           ],
         }],
         ['use_ozone==1', {
           'dependencies': [
             '../ozone/ozone.gyp:ozone',
             '../ozone/ozone.gyp:ozone_base',
           ],
         }],
+        ['OS=="win" or use_ozone==1', {

[mfomitchev, 2015/10/09 13:56:54]

The preferred way is to include the file in the main list and then exclude it
based on the condition rather than the other way around. This probably applies
to GN as well.
https://chromium.googlesource.com/external/gyp/+/master/docs/UserDocumentatio...

[mfomitchev, 2015/10/09 13:56:54]

Do you want to add android in a separate CL?

[no sievers, 2015/10/09 19:31:50]

Done.

[no sievers, 2015/10/09 19:31:50]

Well, might as well do it now that it's so straightforward. Done.

+          'sources': [
+            'window_tree_host_platform.cc',
+            'window_tree_host_platform.h',
+          ],
+        }],
       ],
     },
     {
       # GN version: //ui/aura:test_support
       'target_name': 'aura_test_support',
       'type': 'static_library',
       'dependencies': [
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
         '../base/ime/ui_base_ime.gyp:ui_base_ime',
@@ skipping 179 matching lines @@
               'dependencies': [
                 '../../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }