build: do not e2e tests on saucelabs (#12700)

* No longer runs e2e tests inside of Saucelabs because Chrome is also installed on Travis CI and we should keep Saucelabs available for other browsers that don't run inside of Dockers or Travis.

scripts/ci/sources/tunnel.sh

@@ -8,7 +8,7 @@ WAIT_RETRIES=2
 
 start_tunnel() {
   case "$MODE" in
-    e2e*|saucelabs*)
+    saucelabs*)
       ./scripts/saucelabs/start-tunnel.sh
       ;;
     browserstack*)
@@ -21,7 +21,7 @@ start_tunnel() {
 
 wait_for_tunnel() {
   case "$MODE" in
-    e2e*|saucelabs*)
+    saucelabs*)
       retryCall ${WAIT_RETRIES} ./scripts/saucelabs/wait-tunnel.sh
       ;;
     browserstack*)
@@ -34,7 +34,7 @@ wait_for_tunnel() {
 
 teardown_tunnel() {
   case "$MODE" in
-    e2e*|saucelabs*)
+    saucelabs*)
       ./scripts/saucelabs/stop-tunnel.sh
       ;;
     browserstack*)

scripts/ci/travis-testing.sh

@@ -34,7 +34,9 @@ wait_for_tunnel
 if is_lint; then
   $(npm bin)/gulp ci:lint
 elif is_e2e; then
-  $(npm bin)/gulp ci:e2e
+  # Run e2e tests inside of Xvfb because we need to test the HTML Fullscreen API's that cannot
+  # be tested within Chrome headless.
+  xvfb-run -a --server-args='-screen 0, 1024x768x16' $(npm bin)/gulp ci:e2e
 elif is_aot; then
   $(npm bin)/gulp ci:aot
 elif is_payload; then