Add x11-utils to install-build-deps.sh

xdpyinfo from the package x11-utils is necessary for run-webkit-tests.

BUG=749222
[email protected]

Change-Id: I4ee4d880895e56c947741debdaa2095f03efc91e
Reviewed-on: https://chromium-review.googlesource.com/601354
Reviewed-by: Dirk Pranke <[email protected]>
Commit-Queue: Thomas Anderson <[email protected]>
Cr-Commit-Position: refs/heads/master@{#492466}
diff --git a/build/install-build-deps.sh b/build/install-build-deps.sh
index 0a1e3f3..f897280f 100755
--- a/build/install-build-deps.sh
+++ b/build/install-build-deps.sh
@@ -208,6 +208,7 @@
   subversion
   ttf-dejavu-core
   wdiff
+  x11-utils
   xcompmgr
   zip
   $chromeos_dev_list