Roll src/third_party/skia/ d32303e72..693fdbd6b (4 commits).

https://skia.googlesource.com/skia.git/+log/d32303e7276b..693fdbd6b81a

$ git log d32303e72..693fdbd6b --date=short --no-merges --format='%ad %ae %s'
2017-01-12 reed refFoo variant for getters that naturally have a sk_sp
2017-01-12 mtklein skia_android_serial = "auto"
2017-01-12 brianosman Cleanup GrPixelConfig helper functions
2017-01-12 jvanverth Fix perf regression with SDF paths

BUG=677889

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/2627953004
Cr-Commit-Position: refs/heads/master@{#443294}

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': 'd32303e7276b8a824a4d95e4b1676f9eb201ed5e',
+  'skia_revision': '693fdbd6b81a860657612e7604430dd55d6e721b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.