Make tests relying on xeokit work locally

Tests using xeokit, the 3d visualization kit from BIM edition, did not
work locally for me. It fails with the following devtools console error:
"[ERROR] [Canvas '__0']: Failed to get a WebGL context". They do pass on
CI though.

One example test is `./modules/bim/spec/features/model_viewer_spec.rb`.

In an effort to make these tests pass both on CI and locally, I'm trying
some flags seen on https://stackoverflow.com/q/70948512/177665 to keep
the GPU enabled, but use a software implementation. It works locally.
Not sure yet if it works in a docker container and on CI.

spec/support/browsers/chrome.rb

@@ -16,14 +16,17 @@ def register_chrome(language, name: :"chrome_#{language}", headless: "old", over
     end
 
     options.add_argument("--no-sandbox")
-    options.add_argument("--disable-gpu")
     options.add_argument("--disable-popup-blocking")
     options.add_argument("--lang=#{language}")
     options.add_preference("intl.accept_languages", language)
     # This is REQUIRED for running in a docker container
     # https://github.com/grosser/parallel_tests/issues/658
     options.add_argument("--disable-dev-shm-usage")
     options.add_argument("--disable-smooth-scrolling")
+    # Software GPU to avoid the dreaded "[ERROR] [Canvas '__0']: Failed to get a
+    # WebGL context" error for tests using xeokit, adapted from answers of
+    # https://stackoverflow.com/q/70948512/177665 and
+    options.add_argument("--use-gl=angle")
     # Disable "Select your search engine screen"
     options.add_argument("--disable-search-engine-choice-screen")