Roll src/third_party/skia/ 4f5e1d4ff..9d78afdd3 (7 commits)

https://skia.googlesource.com/skia.git/+log/4f5e1d4ff3fa..9d78afdd3d87

$ git log 4f5e1d4ff..9d78afdd3 --date=short --no-merges --format='%ad %ae %s'
2017-12-07 borenet Revert "[infra] Move commands from isolates to gen_tasks.go"
2017-12-06 herb Fix buffer off-by-one error.
2017-12-07 borenet [infra] Move commands from isolates to gen_tasks.go
2017-12-07 rmistry Do not skip trybots for uploads by update-docs
2017-12-06 benjaminwagner Specify long build ID in Android dimensions.
2017-12-07 bsalomon Revert "Add define to use customize vulkan header."
2017-12-06 scroggo Update to the latest version of libjpeg-turbo

Created with:
  roll-dep src/third_party/skia
BUG=792316


The AutoRoll server is located here: https://autoroll.skia.org

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


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
TBR=rmistry@chromium.org

Change-Id: I6b3738c95a764c9efbaefee9a7895cd739a65211
Reviewed-on: https://chromium-review.googlesource.com/814276Reviewed-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@{#522446}

DEPS

@@ -74,7 +74,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '4f5e1d4ff3fa9f240398c9a08be94beb1c16dad0',
+  'skia_revision': '9d78afdd3d873b63dfbba17f9039a64cae62e3b8',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.