GitLab

Using foreground blur make it possible to cache the render surface and
provide good performance.

Bug: 738185
Test: tested locally.
Change-Id: I838c072ecd4deeb9e181e08644d215877616f0ef
Reviewed-on: https://chromium-review.googlesource.com/578713
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488618}