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Instead of blindly using a fake presentation feedback result,
use the wayland provided one if available. If not, pretend there is
a feedback, but provide a faked one.

In order to provide feedback, the callback, which comes from
the GPU, is stored in the Buffer instance. Although,
both frame and presentation feedback are setup, the frame callback
always comes first. Thus, we store the result and once the
feedback comes, we use the previous swap result and the presentation
feedback to let the GPU know the status of the request.

Bug: 859012
Change-Id: I4f4628be6101149daa30b6c74f3490254ace0fad
Reviewed-on: https://chromium-review.googlesource.com/1193883
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589467}