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This CL enables partial swap support in Wayland by
enabling SupportsPostSubBuffer.

A damage region describes the regions where the pending
buffer is different from the current surface contents, and where
the surface therefore needs to be repainted.

Enabling this needs requires fixing http://crbug.com/339493
as well for Intel drivers.

Bug: 880726
Change-Id: I3bb2c7f876e3b5297c0d5595e309e3853772430f
Reviewed-on: https://chromium-review.googlesource.com/1206370
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589477}