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The visual shape of a pointer cursor is rendered at a surface attached
to the wl_pointer object and backed by a wl_buffer.  The WaylandCursor
class tried to reuse the buffer regardless of whether the compositor
released it, which resulted in that the cursor shape didn't change
when a new bitmap had been submitted.

This CL simplifies the process: a new buffer is created and attached
each time the new bitmap is submitted, and the old ones are held until
the compositor releases them.

R=msisov@igalia.com

Bug: 928260
Change-Id: I54cf679568276eddbd5c8042d05fe05de25f61d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1503374
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Reviewed-by: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#638521}