Make File-Picker modal on Linux

ui/views/widget/desktop_aura/x11_desktop_handler.cc

Index: ui/views/widget/desktop_aura/x11_desktop_handler.cc
diff --git a/ui/views/widget/desktop_aura/x11_desktop_handler.cc b/ui/views/widget/desktop_aura/x11_desktop_handler.cc
index b7ca334936c924ce4cfac5ed073e300c0c6779ae..259a3f68a2e1fd9e6c98832e7bc95faf8acf7ea1 100644
--- a/ui/views/widget/desktop_aura/x11_desktop_handler.cc
+++ b/ui/views/widget/desktop_aura/x11_desktop_handler.cc
@@ -216,8 +216,13 @@ void X11DesktopHandler::OnActiveWindowChanged(::Window xid,
   if (active_state == ACTIVE) {
     DesktopWindowTreeHostX11* new_host =
         views::DesktopWindowTreeHostX11::GetHostForXID(xid);
-    if (new_host)
+    if (new_host) {
       new_host->HandleNativeWidgetActivationChanged(true);

[sadrul, 2015/07/08 15:02:31]

We don't actually want to call this if |new_host| has a modal dialog, right?

[joone, 2015/07/08 17:16:45]

Yes, we may not need to call this. I will test it.

+      // Set focus to the modal dialog instead of the host window.
+      if (new_host->GetModalDialog())
+        XSetInputFocus(xdisplay_, new_host->GetModalDialog(),
+            RevertToParent, CurrentTime);
+    }
   }
 }