Add xorg package dependency.

Adds xorg dependency required for related patch crrev.com/c/4265138.

Bug: 1417069
Change-Id: I646e372dcf32b165698f5bb3080693cd485769a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5078248
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Brad Triebwasser <btriebw@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1231623}
diff --git a/build/install-build-deps.py b/build/install-build-deps.py
index e534017..5d1153d1 100755
--- a/build/install-build-deps.py
+++ b/build/install-build-deps.py
@@ -374,6 +374,7 @@
       "libxrender1",
       "libxtst6",
       "x11-utils",
+      "xorg", # TODO(crbug.com/1417069): Experimental.
       "xvfb",
       "zlib1g",
   ]