Roll src/third_party/skia/ 4997e14c8..dc0b12ec7 (13 commits)

https://skia.googlesource.com/skia.git/+log/4997e14c80f1..dc0b12ec7a2d

$ git log 4997e14c8..dc0b12ec7 --date=short --no-merges --format='%ad %ae %s'
2018-03-08 weili Harden size check during textblob deserialization
2018-03-08 angle-skia-autoroll Roll skia/third_party/externals/angle2/ 5164b797c..80964f97e (6 commits)
2018-03-08 reed Change behavior of custom image serial/deserial
2018-03-08 egdaniel Add ability to uninstantiate lazy proxies after every flush.
2018-03-08 brianosman Fill in some missing virtuals from canvas subclasses
2018-03-08 robertphillips Split GrDDL- & GrDirect- Contexts into their own files
2018-03-08 reed tighten check when we might overflow legacy shader math
2018-03-08 liyuqian Use clippedIR instead of clipBounds to filter coverage deltas
2018-03-06 benjaminwagner Upgrade IntelIris540 Win10 GPU driver, take 2.
2018-03-05 pirama Re-enable PGO for Skia
2018-03-08 robertphillips Fix preAbandonContext bot
2018-03-08 csmartdalton Revert "ccpr: Draw curves in a single pass"
2018-03-08 csmartdalton Revert "ccpr: Simplify triangle corners"

Created with:
  roll-dep src/third_party/skia
BUG=809200


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=fmalita@chromium.org

Change-Id: I9eaaf639d3a8850ef6dec1c62a067569b8b49f74
Reviewed-on: https://chromium-review.googlesource.com/956612
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@{#542007}

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': '4997e14c80f133ad43ce17e7b6adab55a37b9ada',
+  'skia_revision': 'dc0b12ec7a2de9ae4836f90c66b4f8ff3558f0ba',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.