Roll src/third_party/skia/ cefc1b974..c68ba1d7d (9 commits)

https://skia.googlesource.com/skia.git/+log/cefc1b97405d..c68ba1d7d981

$ git log cefc1b974..c68ba1d7d --date=short --no-merges --format='%ad %ae %s'
2018-02-20 caryclark fix more include generation bugs
2018-02-20 kjlubick Roll Pixel to O 8.1
2018-02-20 fmalita SlideDir focus tweaks
2018-02-20 fmalita Delete SkottieSlide2
2018-02-20 skcms-skia-autoroll Roll skia/third_party/externals/skcms/ c9b7366e8..08d4cf2b3 (1 commit)
2018-02-20 egdaniel Update createWrappedRenderTargetProxy with BackendRT to work with lazy proxies.
2018-02-16 dwkang Start thread pool in skia_dm on Android.
2018-02-20 stephana Revert "Increase ninja thread count for Android build on Linux."
2018-02-20 reed don't trust stored segment mask

Created with:
  roll-dep src/third_party/skia


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=djsollen@chromium.org

Change-Id: I42e49f355dc138073abd6901f0d98b0c588f82d5
Reviewed-on: https://chromium-review.googlesource.com/926703Reviewed-by: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#537831}

DEPS

@@ -79,7 +79,7 @@ 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': 'cefc1b97405d7bad2c621987394fc2d0c6300887',
+  'skia_revision': 'c68ba1d7d9817915592e2077ba19c463e7f2b254',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.