Roll src/third_party/skia/ 94fddf838..f40ae1a4b (5 commits)

https://skia.googlesource.com/skia.git/+log/94fddf83816a..f40ae1a4b536

$ git log 94fddf838..f40ae1a4b --date=short --no-merges --format='%ad %ae %s'
2017-09-25 reed Revert "migrate to sk_sp for SkFontMgr API"
2017-09-25 benjaminwagner Specify CPU for CT Swarming tasks.
2017-09-25 reed migrate to sk_sp for SkFontMgr API
2017-09-25 mtklein Simplify / fix SkBitmap::ReadRawPixels()
2017-09-22 enne Make SkPath::readFromMemory failure silent

Created with:
  roll-dep src/third_party/skia
BUG=765858


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_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=jvanverth@chromium.org

Change-Id: Id721b8de8164bd59065b7a4a5203a5689e1022a3
Reviewed-on: https://chromium-review.googlesource.com/682954
Reviewed-by: Skia Deps Roller <skia-deps-roller@chromium.org>
Commit-Queue: Skia Deps Roller <skia-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504186}