Roll src/third_party/skia/ 636270245..8895b72f7 (1 commit).

https://chromium.googlesource.com/skia.git/+log/636270245fb4..8895b72f789e

$ git log 636270245..8895b72f7 --date=short --no-merges --format='%ad %ae %s'
2015-12-28 mtklein Try using std::call_once

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=mtklein@google.com

Review URL: https://codereview.chromium.org/1550263002

Cr-Commit-Position: refs/heads/master@{#367059}

DEPS

@@ -39,7 +39,7 @@ 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': '636270245fb486559b0324e9bb9e794d56bc3101',
+  'skia_revision': '8895b72f789e5dc8bb99cb9727875439005fc919',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.