Roll src/third_party/skia/ 4259797ef..dab15f7a0 (3 commits)

https://skia.googlesource.com/skia.git/+log/4259797efdf3..dab15f7a02dd

$ git log 4259797ef..dab15f7a0 --date=short --no-merges --format='%ad %ae %s'
2018-03-22 djsollen Revert "Remove legacy precision boundary"
2018-03-22 caryclark update SkIRect centerx centery docs
2018-03-22 angle-skia-autoroll Roll skia/third_party/externals/angle2/ 3395c8b96..8b92c53b8 (1 commit)

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;luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
TBR=jvanverth@chromium.org

Change-Id: Idb474902ff53ae80a0bf94b54afd04d55a252132
Reviewed-on: https://chromium-review.googlesource.com/975582
Commit-Queue: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Reviewed-by: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#545094}

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': '4259797efdf354d0ad5b2c67f0027124f4344a33',
+  'skia_revision': 'dab15f7a02ddaa2a6977a14d5d04955bd39350ab',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.