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This patch plumbs PaintImage into PaintShaders instead of SkImage.
With the patch to not construct SkPaint and instead using PaintFlags,
it becomes possible to introspect the flags to pull off PaintImage used
to construct it.

R=khushalsagar@chromium.org, chrishtr@chromium.org

Change-Id: Ia01ce40b1586b90172421ba99009baeb604fd937
Reviewed-on: https://chromium-review.googlesource.com/576868Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Vladimir Levin <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488812}