Roll src/third_party/skia/ 1215c6ac9..cd35baa8b (4 commits).
Roll src/third_party/skia/ 1215c6ac9..cd35baa8b (4 commits).

https://chromium.googlesource.com/skia.git/+log/1215c6ac94ec..cd35baa8bf16

$ git log 1215c6ac9..cd35baa8b --date=short --no-merges --format='%ad %ae %s'
2016-03-24 tomhudson Add missing SK_API to SkSwizzle.h GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1828733003
2016-03-24 brianosman https://codereview.chromium.org/1830973002 fixed this bug. Re-enable the tests and remove comments referencing it.
2016-03-24 robertphillips Switch new SkImageFilter internal methods over to sk_sp
2016-03-24 brianosman Convert Gray8 images to N32 before uploading. Previously, we were treating them as Alpha8, which was wrong. Fixes incorrect images on the filterbitmap_image_mandrill_64.png_g8 GM.

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=bsalomon@google.com

Review URL: https://codereview.chromium.org/1830633004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#383074}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk