Make File-Picker modal on Linux

chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
index f3e6249be2acdbb616fab1f1414a32826c25be95..377bbd2adfe503a3ffc7a355df6eaa2fc672f584 100644
--- a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.h"
 
+#include <gdk/gdkx.h>
 #include <gtk/gtk.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -31,6 +32,7 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 #include "ui/strings/grit/ui_strings.h"
+#include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 #include "ui/views/widget/desktop_aura/x11_desktop_handler.h"
 
 namespace {
@@ -163,9 +165,11 @@ void SelectFileDialogImplGTK::SelectFileImpl(
 
   params_map_[dialog] = params;
 
-  // TODO(erg): Figure out how to fake GTK window-to-parent modality without
-  // having the parent be a real GtkWindow.
-  gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
+  // Disable input events handling in the host window to make this dialog modal.
+  views::DesktopWindowTreeHostX11* host =
+      views::DesktopWindowTreeHostX11::GetHostForXID(
+      owning_window->GetHost()->GetAcceleratedWidget());
+  host->DisableEventListening(GDK_WINDOW_XID(gtk_widget_get_window(dialog)));
 
   gtk_widget_show_all(dialog);
 
@@ -424,6 +428,12 @@ void SelectFileDialogImplGTK::FileDialogDestroyed(GtkWidget* dialog) {
   aura::Window* parent = GetAuraTransientParent(dialog);
   if (!parent)
     return;
+
+  views::DesktopWindowTreeHostX11* host =
+      views::DesktopWindowTreeHostX11::GetHostForXID(
+      parent->GetHost()->GetAcceleratedWidget());
+  host->EnableEventListening();
+
   std::set<aura::Window*>::iterator iter = parents_.find(parent);
   if (iter != parents_.end()) {
     (*iter)->RemoveObserver(this);