This is a reland of cba64462d2
... with a fix to SkColorFilterShader::onAppendStages() to
copy out the alpha. The blitters sometimes outlive the shader.
Original change's description:
> hide color filters from blitters
>
> This is all guarded by the old define we never rebaselined.
>
> Had to make some upgrades to SkColorFilterShader to support
> replacing an SkPaint's shader and color filter with a single
> merged SkColorFilterShader. Our pipeline's order of operations
> is
>
> 1) shader
> 2) scale by paint alpha
> 3) color filter
>
> but SkColorFilterShader had no way to get that paint alpha in
> the middle there, so I added one.
>
> Change-Id: Ibc1448c1b421747086030337c1a30b8f0af4aa5e
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/250296
> Commit-Queue: Mike Klein <mtklein@google.com>
> Reviewed-by: Mike Reed <reed@google.com>
Cq-Include-Trybots: skia.primary:Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Debug-All-ASAN
Change-Id: Ia98dbeaba6220a60d195c0ef967772c9dce882a2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/250596
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
96bce8f919