Roll src/third_party/skia/ 71b762f2a..1c038af27 (3 commits).

https://skia.googlesource.com/skia.git/+log/71b762f2aca1..1c038af278a6

$ git log 71b762f2a..1c038af27 --date=short --no-merges --format='%ad %ae %s'
2016-12-01 reed Revert "Revert "remove (empty) SkXfermode.h""
2016-12-01 halcanary No SkEncodeImageAsKTX for ANDROID_FRAMEWORK
2016-11-30 msarett SkColorSpaceXform bug fixes

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/2542133002
Cr-Commit-Position: refs/heads/master@{#435626}

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': '71b762f2aca1c8bda51f68ee31157d2af41aa34e',
+  'skia_revision': '1c038af278a69186e988dd9348b4089d78759492',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.