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

win8/win8.gyp

Index: win8/win8.gyp
diff --git a/win8/win8.gyp b/win8/win8.gyp
index 8131fa37da12eae9801a511e8d6f6f7bfd99b121..4c686249957a54aaa69f643a75ec5b4a7af97d8d 100644
--- a/win8/win8.gyp
+++ b/win8/win8.gyp
@@ -9,6 +9,35 @@
     '../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',