GitLab

DrawRPDQParams now just holds on to an SkShader that represents the mask image
and the local matrix that needs to be applied to it. This removes a use of
SkShaderMaskFilter that tried to combine the mask shader into the SkPaint of
the draw. Instead, the mask is always applied by using SkCanvas::clipShader,
which helps unify the code between a layer-needing RPDQ, an image RPDQ, and
a solid color RPDQ. Having a mask image also no longer impacts whether or not
a saveLayer() is needed because it is applied last (as desired), so
skia_renderer no longer has to juggle the order that effect is applied in.

Change-Id: I3d9ce085d498fabec42e112b0cb36e9707b96c8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303672Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Cr-Commit-Position: refs/heads/master@{#789580}