Add accessibility_tree_formatter_qt

Needed by chrome://accessibility



Updates chromium to related change:
224fc0748a Do not assert on --disable-gpu
0ba5e6626a FIXUP: Add ifdefs to exclude ATL and accessibility from the build

Change-Id: Ida0b03048ab6aa04686251d16ccfbf4855a37690
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>