Update web-platform-tests to revision 3bfdeb8976fc51748935c8d1f1014dfba8e08dfb

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

@@ -0,0 +1,29 @@
+FROM ubuntu:18.04
+
+# No interactive frontend during docker build
+ENV DEBIAN_FRONTEND=noninteractive \
+    DEBCONF_NONINTERACTIVE_SEEN=true
+
+RUN apt-get -qqy update \
+  && apt-get -qqy install \
+    bzip2 \
+    git \
+    locales \
+    python \
+    python-pip \
+    tzdata \
+    zstd
+
+RUN pip install --upgrade pip
+RUN pip install virtualenv
+RUN pip install requests
+
+ENV TZ "UTC"
+RUN echo "${TZ}" > /etc/timezone \
+  && dpkg-reconfigure --frontend noninteractive tzdata
+
+# Set the locale
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8

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

@@ -14,9 +14,6 @@ set -ex
 
 REMOTE=${1:-https://github.com/web-platform-tests/wpt}
 REF=${2:-master}
-REVISION=${3:-FETCH_HEAD}
-BROWSER=${4:-all}
-CHANNEL=${5:-nightly}
 
 cd ~
 
@@ -27,15 +24,6 @@ git init
 git remote add origin ${REMOTE}
 
 # Initially we just fetch 50 commits in order to save several minutes of fetching
-retry git fetch --quiet --depth=50 --tags origin ${REF}
+retry git fetch --quiet --depth=50 --tags origin ${REF}:task_head
 
-if [[ ! `git rev-parse --verify -q ${REVISION}` ]];
-then
-    # But if for some reason the commit under test isn't in that range, we give in and
-    # fetch everything
-    retry git fetch -q --unshallow ${REMOTE}
-    git rev-parse --verify ${REVISION}
-fi
-git checkout -b build ${REVISION}
-
-source tools/ci/start.sh
+git checkout --quiet task_head