commit 15eef87662877a27a7c580a42f05e94c5e4b51eb
author Xianzhu Wang <wangxianzhu@chromium.org> Thu Dec 03 02:00:03 2020
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu Dec 03 02:00:03 2020
tree 49791985b9f441df1dda91df458083d9c06e8a94
parent 2d7f8b9980eb6be9c6a444342d5ec96860210b05

Avoid problem of decomposited effect on SVG root

This CL avoids the problem by

- Disabling compositing of SVG child for will-change:top etc. which
  don't apply.

- Including CompositingReason::kSVGRoot on the effect node (if exists)
  on SVG root to prevent the effect node from being decomposited during
  PaintArtifactCompositor::Update(), to ensure the composited layer for
  SVG root will create a render surface when needed. We still need to
  create a better solution for this (tracked by crbug.com/1154097).

Because CompositingReason::kSVGRoot is for pre-CompositeAfterPaint
CompositeSVG only to create a GraphicsLayer with
ShouldCreateLayersAfterPaint, this CL also disable the logic for
CompositeAfterPaint.

Bug: 1152691
Change-Id: Ic194501698c0afd5a058647344f812077ed07709
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567614
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833101}