Roll src/third_party/skia/ 344ec42f6..d85dd53e2 (6 commits).

https://skia.googlesource.com/skia.git/+log/344ec42f60fd..d85dd53e288e

$ git log 344ec42f6..d85dd53e2 --date=short --no-merges --format='%ad %ae %s'
2016-12-15 brianosman Shrink the SkImageGenerator API
2016-12-14 stani Exclude complexclip4 GM tests from tile_rt config
2016-12-15 reed speedup dynamicwstream
2016-12-13 mtklein Port SkResourceCache to SkTHashTable
2016-12-15 reed remove unused dynamicwstream.snapshotAsData()
2016-12-15 kjlubick Update Pixel Cs -> NFM26H

BUG=429375

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=msarett@google.com

Review-Url: https://codereview.chromium.org/2584513005
Cr-Commit-Position: refs/heads/master@{#438953}

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': '344ec42f60fd9d10f14d4ffaf8e7b7916bb20bcc',
+  'skia_revision': 'd85dd53e288ed5d979e5393085ab894187383a09',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.