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 67 matching lines @@
 
 // Informs the browser of the result of a file open operation.
 IPC_MESSAGE_CONTROL2(MetroViewerHostMsg_FileOpenDone,
                      bool,           /* success */
                      string16)       /* 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 */
+                     string16)       /* filepath*/

[palmer, 2013/04/18 22:58:08]

This, and the others, should really be base::FilePath. Can you please change
this one, and file a bug to convert the others too?

[ananta, 2013/04/19 00:23:24]

I changed all the IPCs to take in FilePaths.

 
 // 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)
@@ skipping 19 matching lines @@
 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 */
 
+// Requests the viewer to display the select folder dialog.
+IPC_MESSAGE_CONTROL1(MetroViewerHostMsg_DisplaySelectFolder,
+                     string16)   /* title */