Roll src/third_party/skia/ c25437da5..50b2084bd (1 commit)

https://skia.googlesource.com/skia.git/+log/c25437da5c6a..50b2084bd15e

$ git log c25437da5..50b2084bd --date=short --no-merges --format='%ad %ae %s'
2017-07-29 fmalita Gradient stages cleanup

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=liyuqian@chromium.org

Change-Id: I00a4ca54d2310622544c2d46bebf0c7607eaae9e
Reviewed-on: https://chromium-review.googlesource.com/593094Reviewed-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@{#490684}

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': 'c25437da5c6a3e5766c7811cfd484c5ef1b2861e',
+  'skia_revision': '50b2084bd15e7aea416dc8c6fd2373864c50f023',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.