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Animated cursor assets were not being loaded because GetCursorDataFor
was used for all cursors, instead of using GetAnimatedCursorDataFor when
the cursor was animated.

With this CL, both set of cursors are merged so they can be retrieved
with a single call.

To ease these changes, ImageCursor, which was a very thin layer over
CursorLoader, was merged into the latter. This change has the benefit of
unifying the cursor loading code path of Ash with the one of the other
Aura platforms and changing Ash on Linux to use the Chromium assets
instead of the platform cursors, as when running on Chrome OS devices.

The only behavior change with respect to ImageCursors is that the cached
cursors will be removed on display changes, instead of reloaded.

Bug: 1135515
Change-Id: Iedf84290bf3792c3ce06cfad0be1b5c0e2d96946
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440760
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815678}