Roll src/third_party/skia/ 3ee255f25..272b31129 (2 commits).

https://chromium.googlesource.com/skia.git/+log/3ee255f25954..272b311298d7

$ git log 3ee255f25..272b31129 --date=short --no-merges --format='%ad %ae %s'
2016-08-31 mtklein GN: forgot Clang+ccache fix on Android.  And sort.
2016-08-31 mtklein GN: add sources_when_disabled to optional

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
TBR=bsalomon@google.com

Review-Url: https://codereview.chromium.org/2300603002
Cr-Commit-Position: refs/heads/master@{#415621}

DEPS

@@ -36,7 +36,7 @@ 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': '3ee255f259541eff1251c8007f9135e8d664346a',
+  'skia_revision': '272b311298d78569c88130ceee3096b876fcbf25',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.