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For PaintShader and PaintImage, we lazily create the internally cached
SkShader and SkImage. This can cause this access to be racy when later
done on the raster worker threads during playback. Ensure that these
objects are created during Paint object construction.

R=enne@chromium.org, vmpstr@chromium.org

Bug: 771156
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I8538442e0459e1762a81d5fb150301621360d850
Reviewed-on: https://chromium-review.googlesource.com/701974Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506792}