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After https://chromium-review.googlesource.com/c/angle/angle/+/2210151
it's required to pass platform type for X11 so that correct
backend is chosen so that X11/Linux doesn't become broken when compiled
with use_x11 && use_ozone.

Bug: 789065
Change-Id: Ia2e11a89fc358c9976d216f6729c49a28d4661aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366755Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#800469}