[Telemetry] Implement automatic installation of optional openCV dependecy.

build/install-build-deps.sh

Index: build/install-build-deps.sh
diff --git a/build/install-build-deps.sh b/build/install-build-deps.sh
index a0f11db7e13d31d0d1bff670ecf08432e9e724c3..930e1323bc07afacdf9cb37be011c2b4c55e1fc8 100755
--- a/build/install-build-deps.sh
+++ b/build/install-build-deps.sh
@@ -155,6 +155,9 @@ nacl_list="g++-mingw-w64-i686 lib32z1-dev
            libxrandr2:i386 libxss1:i386 libxtst6:i386 texinfo xvfb
            ${naclports_list}"
 
+# Packages needed for telemetry only
+telemetry_list="python-opencv"

[tonyg, 2014/10/23 16:56:34]

Please land this change first. I believe we'll have to request Chrome-Labs to
explicitly run this script on the bots before we make the Telemetry change that
depends on it. Also, we (Dave?) will need to figure out a way to pull
third-party deps into the standalone zip.

+
 # Find the proper version of libgbm-dev. We can't just install libgbm-dev as
 # it depends on mesa, and only one version of mesa can exists on the system.
 # Hence we must match the same version or this entire script will fail.
@@ -293,8 +296,8 @@ else
 fi
 
 packages="$(
-  echo "${dev_list} ${lib_list} ${dbg_list} ${arm_list} ${nacl_list}" |
-  tr " " "\n" | sort -u | tr "\n" " "
+  echo "${dev_list} ${lib_list} ${dbg_list} ${arm_list} ${nacl_list} " \
+    "${telemetry_list}" | tr " " "\n" | sort -u | tr "\n" " "
 )"
 
 if [ 1 -eq "${do_quick_check-0}" ] ; then