Some tests take longer than others, and so may want to set a custom
timeout so that they pass, without increasing the timeout for all other
tests. For example, this is done in WPT.
Add an `internals.setTestTimeout(milliseconds)` method that overrides
the test runner's default timeout for the currently-run test.
This triggers a mouse button press without the up event, allowing us to
e.g. simulate a selection by moving the mouse while keeping the button
depressed.
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.
Resulting in a massive rename across almost everywhere! Alongside the
namespace change, we now have the following names:
* JS::NonnullGCPtr -> GC::Ref
* JS::GCPtr -> GC::Ptr
* JS::HeapFunction -> GC::Function
* JS::CellImpl -> GC::Cell
* JS::Handle -> GC::Root
The main motivation behind this is to remove JS specifics of the Realm
from the implementation of the Heap.
As a side effect of this change, this is a bit nicer to read than the
previous approach, and in my opinion, also makes it a little more clear
that this method is specific to a JavaScript Realm.
