Emit synthetic mask for non-2d-axis aligned clip for backdrop effects #28823
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The bug case is that a clip applies to a composited backdrop effect
(backdrop-filter or mix-blend-mode), the clipping element doesn't
create an isolation group for the backdrop effect, and the clip is
not 2d-axis aligned to the containing isolation group. In the case
we need to apply the clip as a synthetic mask. (For normal non-2d-axis
aligned clip we decomposite the clip to emit a paint operation in the
composited layer for the clip.)
Bug: 1202369
Change-Id: I54112516e1603f65ae99d6a2167c8dc1ee6107da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2872248
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#879093}