Return a large bitmap when the large cursor is enabled

Add the ability to access the bitmap of large cursors. This will allow
to use the correct cursor size in Chrome Remote Desktop, WebRTC and
VideoRecordingWatcher.

Bug: 1193775
Change-Id: I4012b44d047bd13dfeb1a7f8b3ba274a1d1fbd02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4334519


Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1118438}