Update web-platform-tests to revision de9a09ab7f605aed6a4b53ed96427412bab76463

tests/wpt/web-platform-tests/tools/docker/Dockerfile

@@ -10,6 +10,7 @@ RUN apt-get -qqy update \
     bzip2 \
     ca-certificates \
     dbus-x11 \
+    earlyoom \
     gdebi \
     git \
     locales \

tests/wpt/web-platform-tests/tools/docker/start.sh

@@ -17,6 +17,10 @@ REVISION=${3:-FETCH_HEAD}
 BROWSER=${4:-all}
 CHANNEL=${5:-nightly}
 
+# Start userspace OOM killer: https://github.com/rfjakob/earlyoom
+# It will report memory usage every minute and prefer to kill browsers.
+sudo earlyoom -p -r 60 --prefer '(chrome|firefox)' --avoid 'python' &
+
 cd ~
 
 mkdir web-platform-tests