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When a pattern (with a transparent background) is used to fill or stroke
a rect, the ShadowBlur is incorrectly applied to the rect mask instead
of the pattern itself.

This is fixed by setting the last param of BaseRenderingContext2D::
Draw() to kNonOpaqueImage when the rect is drawn with a pattern.

Bug: 1020183
Change-Id: I62ae4e298185eb5b7699c2dbf4b9ad962939e464
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219416Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Reviewed-by: Aaron Krajeski <aaronhk@chromium.org>
Reviewed-by: Juanmi Huertas <juanmihd@chromium.org>
Commit-Queue: Teresa Kang <teresakang@google.com>
Cr-Commit-Position: refs/heads/master@{#775121}