Import wpt@767dc2a4f049c761bd146d61de2ea860a895a624

third_party/WebKit/LayoutTests/external/wpt/ci_stability.sh

 set -e
 
 hosts_fixup() {
     echo "travis_fold:start:hosts_fixup"
     echo "Rewriting hosts file"
     echo "## /etc/hosts ##"
     cat /etc/hosts
     sudo sed -i 's/^::1\s*localhost/::1/' /etc/hosts
     sudo sh -c 'echo "
 127.0.0.1 web-platform.test
 127.0.0.1 www.web-platform.test
 127.0.0.1 www1.web-platform.test
 127.0.0.1 www2.web-platform.test
 127.0.0.1 xn--n8j6ds53lwwkrqhv28a.web-platform.test
 127.0.0.1 xn--lve-6lad.web-platform.test
 " >> /etc/hosts'
     echo "== /etc/hosts =="
     cat /etc/hosts
     echo "----------------"
     echo "travis_fold:end:hosts_fixup"
 }
 
 install_chrome() {
     channel=$1
     deb_archive=google-chrome-${channel}_current_amd64.deb
     wget https://dl.google.com/linux/direct/$deb_archive
 
+    # If the environment provides an installation of Google Chrome, the
+    # existing binary may take precedence over the one introduced in this
+    # script. Remove any previously-existing "alternatives" prior to
+    # installation in order to ensure that the new binary is installed as
+    # intended.
+    if sudo update-alternatives --list google-chrome; then
+        sudo update-alternatives --remove-all google-chrome
+    fi
+
     # Installation will fail in cases where the package has unmet dependencies.
     # When this occurs, attempt to use the system package manager to fetch the
     # required packages and retry.
     if ! sudo dpkg --install $deb_archive; then
       sudo apt-get install --fix-broken
       sudo dpkg --install $deb_archive
     fi
 }
 
 test_stability() {
     python check_stability.py $PRODUCT
 }
 
 main() {
     hosts_fixup
     if [ $(echo $PRODUCT | grep '^chrome:') ]; then
        install_chrome $(echo $PRODUCT | grep --only-matching '\w\+$')
     fi
     test_stability
 }
 
 main