Roll src/third_party/skia/ 22f5ef762..439ace939 (5 commits).

https://skia.googlesource.com/skia.git/+log/22f5ef762343..439ace939b6a

$ git log 22f5ef762..439ace939 --date=short --no-merges --format='%ad %ae %s'
2016-12-02 fmalita Rebase non-drawing SkCanvas subclasses to SkNoDrawCanvas
2016-12-02 borenet Fix tasks.json
2016-12-02 brianosman Fix textblobrandomfont GM in F16 configs
2016-12-02 borenet [nobuildbot] Replace presubmit bot with swarmbucket version
2016-12-02 borenet Make all tasks specify an OS version

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=brianosman@google.com

Review-Url: https://codereview.chromium.org/2544373002
Cr-Commit-Position: refs/heads/master@{#436021}

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': '22f5ef762343bebc7d72ef84a703ae453616c4e6',
+  'skia_revision': '439ace939b6aaa58408ece0e9e89b633353571ae',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.