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base::FileDescriptorWatcher is not usable on the main thread because it
is initialized as a UI thread, when an IO thread is required.  Since
it's a UI thread, it's able to dispatch events already without special
FD watching.  All that's required is creating an X11EventSource.  This
CL creates the event source where necessary so that
KeyboardLayoutMonitorLinux can dispatch events.

R=lambroslambrou
CC=rkjnsn@chromium.org

Fixes: 1133481
Change-Id: I6e0a380c7c1168c4b1515be10ec34e67d0ae0d47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444530
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813864}