Roll src/third_party/skia/ 0c5cf5d7a..53f77bd4f (2 commits)

https://skia.googlesource.com/skia.git/+log/0c5cf5d7a260..53f77bd4fdd7

$ git log 0c5cf5d7a..53f77bd4f --date=short --no-merges --format='%ad %ae %s'
2017-04-28 fmalita Initial clip-mask-layer support
2017-04-28 jvanverth Optimizations for analytic shadows.

Created with:
  roll-dep src/third_party/skia


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=scroggo@chromium.org

Change-Id: I1783644d20be8d8950df6db24daf042d277590c3
Reviewed-on: https://chromium-review.googlesource.com/490838Reviewed-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@{#468315}

DEPS

@@ -40,7 +40,7 @@ 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': '0c5cf5d7a26001e774116e470b8df76d01be77ff',
+  'skia_revision': '53f77bd4fdd76525b66b7f26d1c5c550858120df',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.