[autotest] Added dep to dev setup script.

libmysqlclient-dev was required but not installed.

BUG=chromium:626083
TEST=Verified locally

Change-Id: Ia27d16171d9048e352a7d173d4b3cfaec9fec07b
Reviewed-on: https://chromium-review.googlesource.com/358276
Commit-Ready: Justin Giorgi <jgiorgi@google.com>
Tested-by: Justin Giorgi <jgiorgi@google.com>
Reviewed-by: Kevin Cheng <kevcheng@chromium.org>
diff --git a/site_utils/setup_dev_autotest.sh b/site_utils/setup_dev_autotest.sh
index 59f6604..5eaaf17 100755
--- a/site_utils/setup_dev_autotest.sh
+++ b/site_utils/setup_dev_autotest.sh
@@ -179,7 +179,7 @@
 python-imaging libpng12-dev libfreetype6-dev \
 sqlite3 python-pysqlite2 git-core pbzip2 openjdk-6-jre openjdk-6-jdk \
 python-crypto  python-dev subversion build-essential python-setuptools \
-python-numpy python-scipy"
+python-numpy python-scipy libmysqlclient-dev"
 
 if ! sudo apt-get install -y ${PKG_LIST}; then
   echo "Could not install packages: $?"