Roll src/third_party/skia/ ec8f8b064..e6c210ae0 (11 commits; 5 trivial rolls)

https://skia.googlesource.com/skia.git/+log/ec8f8b064340..e6c210ae0113

$ git log ec8f8b064..e6c210ae0 --date=short --no-merges --format='%ad %ae %s'
2017-05-11 msarett Fix Ubuntu-Clang-x86_64-Release-Mini
2017-05-11 jvanverth Classify spot shadows for general shapes
2017-05-11 herb Evenly space gradient stage.
2017-05-11 mtklein proposed: inclusive gradients, exclusive images
2017-05-11 mtklein spin off: always clamp linear gradients
2017-05-11 robertphillips Setup for another attempt to split up opLists

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=stani@chromium.org

Change-Id: I304771b32863a9f92d229f45f06ddb0f432d79ea
Reviewed-on: https://chromium-review.googlesource.com/503494Reviewed-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@{#471153}

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': 'ec8f8b064340b030fc4ce10f6cbbc3d6f63b946f',
+  'skia_revision': 'e6c210ae01137b283ba7c55b3b197771f425eb74',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.