commit 3bc35de4ff086027d50519c9fb40122f27eb82f4
author joone.hur <joone.hur@intel.com> Sat Nov 21 00:26:52 2015
committer Commit bot <commit-bot@chromium.org> Sat Nov 21 00:27:32 2015
tree 50f47ea5db85ad72b33fcf400d0bad8919cc5acf
parent 7ba9b478144998dc08029cddf61e8a48745fef9a

Make File-Picker modal on Linux

Chromium for Linux opens a Gtk file-picker for file browsing, but it is not
modal because there is no GtkWindow as parent of file-picker.

This patch allows the X11 host window to disable input event handling to make
a file-picker modal

The original CL was reverted due to wrong DCHECK with modal_dialog_xid_:
https://codereview.chromium.org/1243503002

BUG=408481
TEST=BrowserSelectFileDialogTest, ModalTest

Review URL: https://codereview.chromium.org/1233913009

Cr-Commit-Position: refs/heads/master@{#360961}