Roll src/third_party/skia/ dbdf6d210..562e681e5 (3 commits).

https://skia.googlesource.com/skia.git/+log/dbdf6d210b7e..562e681e5c60

$ git log dbdf6d210..562e681e5 --date=short --no-merges --format='%ad %ae %s'
2016-11-08 msarett Refactor RGBA/BGRA xform logic in SkCodecs
2016-11-08 liyuqian Relax the extra span's alpha
2016-11-08 liyuqian Do not call blitAntiRect for empty rect

BUG=662800

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
TBR=scroggo@google.com

Review-Url: https://codereview.chromium.org/2482333002
Cr-Commit-Position: refs/heads/master@{#430775}