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

win8/metro_driver/metro_driver.gyp

Index: win8/metro_driver/metro_driver.gyp
diff --git a/win8/metro_driver/metro_driver.gyp b/win8/metro_driver/metro_driver.gyp
index a6f9afa07931379a7abf2984f90abd9f8580343c..caa5ab59671c9ca762146a845eb838d45b2ba40b 100644
--- a/win8/metro_driver/metro_driver.gyp
+++ b/win8/metro_driver/metro_driver.gyp
@@ -65,6 +65,9 @@
           'sources': [
             'display_properties.cc',
             'display_properties.h',
+            'metro_driver.cc',
+            'metro_driver.h',
+            'metro_driver_win7.cc',
             'stdafx.h',
             'winrt_utils.cc',
             'winrt_utils.h',
@@ -72,9 +75,16 @@
           ],
           'conditions': [
             ['use_aura==1', {
+              'dependencies': [
+                '../win8.gyp:metro_viewer_constants',
+              ],
               'sources': [
+                'chrome_app_view_ash.cc',
+                'chrome_app_view_ash.h',
                 'direct3d_helper.cc',
                 'direct3d_helper.h',
+                'file_picker_ash.cc',
+                'file_picker_ash.h',
               ],
               'includes': [
                 'ime/ime.gypi',
@@ -87,6 +97,8 @@
                 'chrome_url_launch_handler.h',
                 'devices_handler.cc',
                 'devices_handler.h',
+                'file_picker.cc',
+                'file_picker.h',
                 'metro_dialog_box.cc',
                 'metro_dialog_box.h',
                 'print_document_source.cc',