This change takes the change we made in 120bc52f23 to patch the imported
WPT aria-utils.js file to use our window.internals.getComputedLabel(el)
function, and moves that patching into the imported WPT testdriver.js
file — in the same way we did in c5966bbdcb.
That centralizes the patching, and avoids the need to patch multiple
other WPT tests we’re likely to import eventually. There are actually
six different WPT test files upstream which we haven’t imported yet that
call window.test_driver_internal.get_computed_label(el) directly — and
that, without this change, we’d otherwise end up needing to patch.
This change adds a window.internals.getComputedLabel(element) function,
for use in testing ARIA-related behavior. It also patches the imported
WPT testdriver.js script’s test_driver.get_computed_role(element)
function to call our window.internals.getComputedRole(element) function.
This change imports the WPT accname/name/comp_embedded_control.html
test, along with related resources files it depends on.
Note that in the wai-aria/scripts/aria-utils.js file, this changes the
get_computed_label call to use our window.internals.getComputedLabel.
