Roll src/third_party/skia/ 92de631ed..e980174d0 (4 commits)

https://skia.googlesource.com/skia.git/+log/92de631edd3e..e980174d0f3a

$ git log 92de631ed..e980174d0 --date=short --no-merges --format='%ad %ae %s'
2017-05-23 mtklein simpler portable round()
2017-05-23 reed add gm to test alpha in drawPatch
2017-05-23 jvanverth Fix TSAN error for shadow cache
2017-05-23 scroggo Revert "sk_fgetsize to not use ftell."

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=brianosman@chromium.org

Change-Id: Ie34a0e5421dab869ca3809669bc630d413c35f83
Reviewed-on: https://chromium-review.googlesource.com/512364Reviewed-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@{#473934}

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': '92de631edd3eb9b3430332d1f1d566e903ea2ea9',
+  'skia_revision': 'e980174d0f3af8e497d9c38851114cc6a3c02e9a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.