Don't trigger paint invalidation for unused properties

The 'buffered-rendering' and 'color-rendering' properties don't actually
do anything, so don't trigger invalidation for them.

Fix up comment about gradient stop properties in the vicinity.

Change-Id: Iaab0717cf7fc0f0c2a7b13dcae73945c556086f9
Reviewed-on: https://chromium-review.googlesource.com/c/1491311
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636115}
1 file changed