Added support for displaying the select folder picker in Chrome ASH on Windows 8.

ui/metro_viewer/metro_viewer_messages.h

 // Copyright 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.
 
 // Multiply-included message file, no include guard.
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 55 matching lines @@
                      uint32)          /* pointer_id */
 IPC_MESSAGE_CONTROL4(MetroViewerHostMsg_TouchMoved,
                      int32,           /* x-coordinate */
                      int32,           /* y-coordinate */
                      uint64,          /* timestamp */
                      uint32)          /* pointer_id */
 
 // Informs the browser of the result of a file save as operation.
 IPC_MESSAGE_CONTROL3(MetroViewerHostMsg_FileSaveAsDone,
                      bool,           /* success */
-                     string16,       /* filename */
+                     base::FilePath, /* filename */
                      int)            /* filter_index */
 
 // Informs the browser of the result of a file open operation.
 IPC_MESSAGE_CONTROL2(MetroViewerHostMsg_FileOpenDone,
                      bool,           /* success */
-                     string16)       /* filename */
+                     base::FilePath) /* filename */
 
 IPC_MESSAGE_CONTROL2(MetroViewerHostMsg_MultiFileOpenDone,
                      bool,                    /* success */
                      std::vector<base::FilePath>)   /* filenames */
 
+// Informs the browser of the result of a select folder operation.
+IPC_MESSAGE_CONTROL2(MetroViewerHostMsg_SelectFolderDone,
+                     bool,           /* success */
+                     base::FilePath) /* filepath*/
 
 // Messages sent from the browser to the viewer:
 
 // Requests the viewer to change the pointer to a new cursor.
 IPC_MESSAGE_CONTROL1(MetroViewerHostMsg_SetCursor,
                      int64         /* cursor */);
 
 // This structure contains the parameters sent to the viewer process to display
 // the file save dialog.
 IPC_STRUCT_BEGIN(MetroViewerHostMsg_SaveAsDialogParams)
 
   // The title of the file save dialog if any.
   IPC_STRUCT_MEMBER(string16, title)
 
   // The suggested file name.
-  IPC_STRUCT_MEMBER(string16, suggested_name)
+  IPC_STRUCT_MEMBER(base::FilePath, suggested_name)
 
   // The save as filter to be used.
   IPC_STRUCT_MEMBER(string16, filter)
 
   // The filter index.
   IPC_STRUCT_MEMBER(uint32, filter_index)
 
   // The default extension.
   IPC_STRUCT_MEMBER(string16, default_extension)
 
 IPC_STRUCT_END()
 
 // Requests the viewer to display the file save dialog.
 IPC_MESSAGE_CONTROL1(MetroViewerHostMsg_DisplayFileSaveAs,
                      MetroViewerHostMsg_SaveAsDialogParams)
 
 // Requests the viewer to display the file open dialog.
 IPC_MESSAGE_CONTROL4(MetroViewerHostMsg_DisplayFileOpen,
-                     string16,   /* title */
-                     string16,   /* filter */
-                     string16,   /* Default path */
-                     bool)       /* allow_multi_select */
+                     string16,       /* title */
+                     string16,       /* filter */
+                     base::FilePath, /* Default path */
+                     bool)           /* allow_multi_select */
 
+// Requests the viewer to display the select folder dialog.
+IPC_MESSAGE_CONTROL1(MetroViewerHostMsg_DisplaySelectFolder,
+                     string16)   /* title */