GitLab

RenderPass's opacity need to be applied as last step. This is for
refection filter case where we expect the opacity to be applied to the
combination of original and reflected content. This is done by applying
the opacity as a color filter.

Bug: 908951
Test: layout tests compositing/reflections/reflection-opacity.html
Change-Id: I84226726b6cae0e294d6409d3e8e93f38648c867
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1534140Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644476}