Add xorg core and video dummy dependencies.

Follow-up to revert crrev.com/c/5166237. Adds the xcore core binaries
and dummy driver instead of the entire xorg package which installs lots
of video / input drivers.

Bug: 1417069, 1513713
Change-Id: I3075508e470c1ed11628c13f2bfb1250c4fc26c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5171264
Commit-Queue: Brad Triebwasser <btriebw@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1243456}

build/install-build-deps.py

@@ -374,6 +374,8 @@ def lib_list():
       "libxrender1",
       "libxtst6",
       "x11-utils",
+      "xserver-xorg-core",  # TODO(crbug.com/1417069): Experimental.
+      "xserver-xorg-video-dummy",  # TODO(crbug.com/1417069): Experimental.
       "xvfb",
       "zlib1g",
   ]