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In order to add serialization for PaintFlags internals, store the
SkPaint internals directly in PaintFlags instead of storing in
an SkPaint itself.

Reland of: https://chromium-review.googlesource.com/c/575511/
TBR=vmpstr@chromium.org,msw@chromium.org,junov@chromium.org

Bug: 737629
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Ida37d539b3d5a5612acdf1466445f4d30b75d5ad
Reviewed-on: https://chromium-review.googlesource.com/580149
Commit-Queue: enne <enne@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488502}