Introdcue AshWindowTreeHost and move ash/chrome specific code in WTH to ash.

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 49 matching lines @@
         'env.h',
         'env_observer.h',
         'input_state_lookup.cc',
         'input_state_lookup.h',
         'input_state_lookup_win.cc',
         'input_state_lookup_win.h',
         'layout_manager.cc',
         'layout_manager.h',
         'remote_window_tree_host_win.cc',
         'remote_window_tree_host_win.h',
-        'root_window_transformer.h',
         'scoped_window_targeter.cc',
         'scoped_window_targeter.h',
         'window.cc',
         'window.h',
         'window_event_dispatcher.cc',
         'window_event_dispatcher.h',
         'window_delegate.h',
         'window_layer_type.h',
         'window_observer.h',
         'window_targeter.cc',
@@ skipping 31 matching lines @@
         '../wm/public/tooltip_client.h',
         '../wm/public/transient_window_client.cc',
         '../wm/public/transient_window_client.h',
         '../wm/public/window_move_client.cc',
         '../wm/public/window_move_client.h',
       ],
       'conditions': [
         ['use_x11==1', {
           'dependencies': [
             '../../build/linux/system.gyp:x11',
-            '../../build/linux/system.gyp:xfixes',
             '../../build/linux/system.gyp:xrandr',
             '../../build/linux/system.gyp:xi',
           ],
         }],
         ['OS=="win"', {
           'dependencies': [
             '../metro_viewer/metro_viewer.gyp:metro_viewer_messages',
             '../../ipc/ipc.gyp:ipc',
           ],
           'sources!': [
@@ skipping 147 matching lines @@
         ['OS=="linux" and ((use_allocator!="none" and use_allocator!="see_use_tcmalloc") or (use_allocator=="see_use_tcmalloc" and linux_use_tcmalloc==1))', {
           'dependencies': [
            # See http://crbug.com/162998#c4 for why this is needed.
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },
   ],
 }