Roll src/third_party/skia/ 671163843..2be687af5 (5 commits).

https://skia.googlesource.com/skia.git/+log/671163843681..2be687af58ec

$ git log 671163843..2be687af5 --date=short --no-merges --format='%ad %ae %s'
2017-01-03 ethannicholas fix skslc crash when ternary parameter types don't match
2017-01-04 msarett Use shared toSRGBD50 matrix in SkPngCodec
2017-01-03 bungeman Stage SkFontMgr factories to return smart pointers.
2017-01-03 mtklein Remove SkImageShader -> SkColorShader optimization.
2017-01-04 fs Scale the result of TightBounds when path was inverse-scaled

BUG=678162

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=csmartdalton@google.com

Review-Url: https://codereview.chromium.org/2611873003
Cr-Commit-Position: refs/heads/master@{#441398}

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': '67116384368195913ec014972b4fc38de2087fb8',
+  'skia_revision': '2be687af58ec1f445c6380457d136562ef27155e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.