SkRasterPipeline preliminaries

    Re-uploading to see if I can get a CL number < 2^31.
    patch from issue 2147533002 at patchset 240001 (http://crrev.com/2147533002#ps240001)

Already reviewed at the other crrev link.
TBR=

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2147533002
CQ_INCLUDE_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Review-Url: https://codereview.chromium.org/2144573004
7 files changed