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

win8/metro_driver/chrome_app_view_ash.cc

Index: win8/metro_driver/chrome_app_view_ash.cc
===================================================================
--- win8/metro_driver/chrome_app_view_ash.cc	(revision 194196)
+++ win8/metro_driver/chrome_app_view_ash.cc	(working copy)
@@ -81,6 +81,8 @@
                           OnDisplayFileOpenDialog)
       IPC_MESSAGE_HANDLER(MetroViewerHostMsg_DisplayFileSaveAs,
                           OnDisplayFileSaveAsDialog)
+      IPC_MESSAGE_HANDLER(MetroViewerHostMsg_DisplaySelectFolder,
+                          OnDisplayFolderPicker)
       IPC_MESSAGE_UNHANDLED(__debugbreak())
     IPC_END_MESSAGE_MAP()
     return true;
@@ -121,6 +123,14 @@
                    params));
   }
 
+  void OnDisplayFolderPicker(const string16& title) {
+    ui_proxy_->PostTask(
+        FROM_HERE,
+        base::Bind(&ChromeAppViewAsh::OnDisplayFolderPicker,
+                   base::Unretained(app_view_),
+                   title));
+  }
+
   scoped_refptr<base::MessageLoopProxy> ui_proxy_;
   ChromeAppViewAsh* app_view_;
 };
@@ -477,13 +487,13 @@
   // The OpenFilePickerSession instance is deleted when we receive a
   // callback from the OpenFilePickerSession class about the completion of the
   // operation.
-  OpenFilePickerSession* open_file_picker =
+  FilePickerSessionBase* file_picker_ =
       new OpenFilePickerSession(this,
                                 title,
                                 filter,
                                 default_path,
                                 allow_multiple_files);
-  open_file_picker->Run();
+  file_picker_->Run();
 }
 
 void ChromeAppViewAsh::OnDisplayFileSaveAsDialog(
@@ -491,13 +501,22 @@
   DVLOG(1) << __FUNCTION__;
 
   // The SaveFilePickerSession instance is deleted when we receive a
-  // callback from the OpenFilePickerSession class about the completion of the
+  // callback from the SaveFilePickerSession class about the completion of the
   // operation.
-  SaveFilePickerSession* save_file_picker =
+  FilePickerSessionBase* file_picker_ =
       new SaveFilePickerSession(this, params);
-  save_file_picker->Run();
+  file_picker_->Run();
 }
 
+void ChromeAppViewAsh::OnDisplayFolderPicker(const string16& title) {
+  DVLOG(1) << __FUNCTION__;
+  // The FolderPickerSession instance is deleted when we receive a
+  // callback from the FolderPickerSession class about the completion of the
+  // operation.
+  FilePickerSessionBase* file_picker_ = new FolderPickerSession(this, title);
+  file_picker_->Run();
+}
+
 void ChromeAppViewAsh::OnOpenFileCompleted(
     OpenFilePickerSession* open_file_picker,
     bool success) {
@@ -529,6 +548,19 @@
   delete save_file_picker;
 }
 
+void ChromeAppViewAsh::OnFolderPickerCompleted(
+    FolderPickerSession* folder_picker,
+    bool success) {
+  DVLOG(1) << __FUNCTION__;
+  DVLOG(1) << "Success: " << success;
+  if (ui_channel_) {
+    ui_channel_->Send(new MetroViewerHostMsg_SelectFolderDone(
+        success,
+        folder_picker->result()));
+  }
+  delete folder_picker;
+}
+
 HRESULT ChromeAppViewAsh::OnActivate(
     winapp::Core::ICoreApplicationView*,
     winapp::Activation::IActivatedEventArgs* args) {