Call to run a file chooser dialog. Only a single file chooser dialog may
be pending at any given time. |mode| represents the type of dialog to
display. |title| to the title to be used for the dialog and may be NULL to
show the default title ("Open" or "Save" depending on the mode).
|default_file_path| is the path with optional directory and/or file name
component that will be initially selected in the dialog. |accept_filters|
are used to restrict the selectable file types and may any combination of
(a) valid lower-cased MIME types (e.g. "text/*" or "image/*"), (b)
individual file extensions (e.g. ".txt" or ".png"), or (c) combined
description and file extension delimited using "|" and ";" (e.g. "Image
Types|.png;.gif;.jpg"). |callback| will be executed after the dialog is
dismissed or immediately if another dialog is already pending. The dialog
will be initiated asynchronously on the UI thread.
Call to run a file chooser dialog. Only a single file chooser dialog may be pending at any given time. |mode| represents the type of dialog to display. |title| to the title to be used for the dialog and may be NULL to show the default title ("Open" or "Save" depending on the mode). |default_file_path| is the path with optional directory and/or file name component that will be initially selected in the dialog. |accept_filters| are used to restrict the selectable file types and may any combination of (a) valid lower-cased MIME types (e.g. "text/*" or "image/*"), (b) individual file extensions (e.g. ".txt" or ".png"), or (c) combined description and file extension delimited using "|" and ";" (e.g. "Image Types|.png;.gif;.jpg"). |callback| will be executed after the dialog is dismissed or immediately if another dialog is already pending. The dialog will be initiated asynchronously on the UI thread.