The code to populate the input data for WebAssembly was incorrectly
overriding values when multiple touches were present due to wrong
indexing.
(cherry picked from commit 470496d8d4)
This actually makes sense(?), when running inside an iframe the active
element might be our canvas, while the iframe itself is not active in
the parent window. Since we consume the event, the iframe does not get
focused in Firefox (but does in Chromium-based browsers), so we must
always call focus to handle such occasions.
(cherry picked from commit 63e2db2499)
In some conditions the events might be generated even when the `gamepad`
object is not accessible due to Security Context requirements.
This commit adds a check to avoid firing the handler in those cases.
(cherry picked from commit 91dbc288cc)
