Roll src/third_party/skia/ 3fdf52cf3..511f2d79b (11 commits).

https://chromium.googlesource.com/skia.git/+log/3fdf52cf389d..511f2d79bf6e

$ git log 3fdf52cf3..511f2d79b --date=short --no-merges --format='%ad %ae %s'
2016-10-04 mtklein Make global use-analytic-AA bit threadsafe.
2016-10-04 reed Revert[4] "replace SkXfermode obj with SkBlendMode enum in paints"
2016-10-04 caryclark disallow -4 pointer
2016-10-04 mtklein Revert of skpbench: add option for gpu timing (patchset #7 id:120001 of https://codereview.chromium.org/2388433003/ )
2016-10-04 borenet Add --test to gen_tasks.go, add presubmit check
2016-10-04 csmartdalton skpbench: add option for gpu timing
2016-10-04 reed ensure we always set the pictinfo.fVersion
2016-10-04 borenet Make binary size analysis upload to skia-perf bucket
2016-10-04 caryclark run dean4 test everywhere
2016-10-04 mtklein Debug Mac test failure.
2016-10-04 benjaminwagner Remove SkFontConfigInterface_direct_google3.

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

Review-Url: https://codereview.chromium.org/2390403002
Cr-Commit-Position: refs/heads/master@{#422949}

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': '3fdf52cf389d58be9ce4b948dfecffd53edb5da2',
+  'skia_revision': '511f2d79bf6ea0ee858a3468d3aa8dcbfca58648',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.