Roll src/third_party/skia/ e7a364d43..621ea115e (1 commit).

https://skia.googlesource.com/skia.git/+log/e7a364d43584..621ea115e0b1

$ git log e7a364d43..621ea115e --date=short --no-merges --format='%ad %ae %s'
2017-01-12 mtklein only copy NDK binaries when using NDK in our standalone builds

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
TBR=kjlubick@google.com

Review-Url: https://codereview.chromium.org/2631483003
Cr-Commit-Position: refs/heads/master@{#443225}

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': 'e7a364d435843a868dcac2c61d78c34e5d3e326c',
+  'skia_revision': '621ea115e0b14467ae8f410ed6ad7a31bbe224e2',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.