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

win8/metro_driver/file_picker.h

Index: win8/metro_driver/file_picker.h
diff --git a/win8/metro_driver/file_picker.h b/win8/metro_driver/file_picker.h
new file mode 100644
index 0000000000000000000000000000000000000000..ef56cb390828860d46184659c7eb78b52920b804
--- /dev/null
+++ b/win8/metro_driver/file_picker.h
@@ -0,0 +1,18 @@
+// 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.
+#ifndef CHROME_BROWSER_UI_METRO_DRIVER_FILE_PICKER_H_
+#define CHROME_BROWSER_UI_METRO_DRIVER_FILE_PICKER_H_
+
+#include <commdlg.h>
+
+// This function behaves similarly to GetOpenFileName, except it uses a
+// Metro file picker to pick a single or multiple file names.
+extern "C" __declspec(dllexport)
+BOOL MetroGetOpenFileName(OPENFILENAME* open_file_name);
+
+extern "C" __declspec(dllexport)
+BOOL MetroGetSaveFileName(OPENFILENAME* open_file_name);
+
+#endif  // CHROME_BROWSER_UI_METRO_DRIVER_FILE_PICKER_H_
+