Revert of Remove remote tree host and some related input and metro_driver code

win8/win8.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,
   },
   'includes': [
     '../build/win_precompile.gypi',
   ],
   'targets': [
     {
+      'target_name': 'metro_viewer_constants',
+      'type': 'static_library',
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'viewer/metro_viewer_constants.cc',
+        'viewer/metro_viewer_constants.h',
+      ],
+    },
+    {
+      'target_name': 'metro_viewer',
+      'type': '<(component)',
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../ipc/ipc.gyp:ipc',
+        '../ui/aura/aura.gyp:aura',
+        '../ui/metro_viewer/metro_viewer.gyp:metro_viewer_messages',
+        'metro_viewer_constants'
+      ],
+      'sources': [
+        'viewer/metro_viewer_process_host.cc',
+        'viewer/metro_viewer_process_host.h',
+      ],
+      'defines': [
+        'METRO_VIEWER_IMPLEMENTATION',
+      ],
+    },
+    {
       'target_name': 'test_support_win8',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         'test_registrar_constants',
       ],
       'sources': [
         'test/open_with_dialog_async.cc',
         'test/open_with_dialog_async.h',
         'test/open_with_dialog_controller.cc',
@@ skipping 10 matching lines @@
       'include_dirs': [
         '..',
       ],
       'sources': [
         'test/test_registrar_constants.cc',
         'test/test_registrar_constants.h',
       ],
     },
   ],
 }