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The main change in this CL is using the same cursor fallback selection
machinery for both Aura/X11 and Ozone/X11. In addition to that:

Cursor loading now uses cursor names, instead of a mix of cursor names
and shapes (as introduced in [0]), given that all shapes can be loaded
by Xcursor using their corresponding name.

The CSS name is preferred over other options, relying on
cursor themes usually linking known cursor names to cursors defined in
the theme, or alternatively, picking alternative cursors as defined in a
fallback table.

It fixes the w-resize fallback changing it to left_side and replaces
v-scroll and h-scroll (introduced in [1]) with all-scroll, as they are
only available on Windows.

[0]: https://crrev.com/c/1998353
[1]: https://crrev.com/c/1638924

Bug: 1029142
Change-Id: If50698d5305135be43cda4eeb48532d23816754f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2245704
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780495}