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

win8/metro_driver/file_picker_ash.h

 // Copyright (c) 2013 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_ASH_H_
 #define CHROME_BROWSER_UI_METRO_DRIVER_FILE_PICKER_ASH_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 126 matching lines @@
       SaveFileAsyncOp;
 
   // Called asynchronously when the save file picker is done.
   HRESULT FilePickerDone(SaveFileAsyncOp* async, AsyncStatus status);
 
   int filter_index_;
 
   DISALLOW_COPY_AND_ASSIGN(SaveFilePickerSession);
 };
 
+// Provides functionality to display the folder picker.
+class FolderPickerSession : public FilePickerSessionBase {
+ public:
+  explicit FolderPickerSession(ChromeAppViewAsh* app_view,
+                               const string16& title);
+
+ private:
+  virtual HRESULT StartFilePicker() OVERRIDE;
+
+  typedef winfoundtn::IAsyncOperation<winstorage::StorageFolder*>
+      FolderPickerAsyncOp;
+
+  // Called asynchronously when the folder picker is done.
+  HRESULT FolderPickerDone(FolderPickerAsyncOp* async, AsyncStatus status);
+
+  DISALLOW_COPY_AND_ASSIGN(FolderPickerSession);
+};
+
 #endif  // CHROME_BROWSER_UI_METRO_DRIVER_FILE_PICKER_ASH_H_