Roll src/third_party/skia/ b6318bf44..67ac33e1f (5 commits).

https://chromium.googlesource.com/skia.git/+log/b6318bf44dd8..67ac33e1f1a1

$ git log b6318bf44..67ac33e1f --date=short --no-merges --format='%ad %ae %s'
2016-09-16 bungeman Remove SK_DECLARE_LEGACY_CREATE_FROM_FONTDATA.
2016-09-16 msarett Fix filling of incomplete images in SkSampledCodec
2016-09-16 halcanary SkPDF:  Implement /ActualText to make text extraction correct.
2016-09-16 mtklein format GN files, and invert if->config to config->if
2016-09-16 tomhudson Improve ColorStopOptimizer safety

BUG=647481

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
TBR=djsollen@google.com

Review-Url: https://codereview.chromium.org/2348003002
Cr-Commit-Position: refs/heads/master@{#419317}

DEPS

@@ -36,7 +36,7 @@ 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': 'b6318bf44dd89dc8465dcf48ba820701eae24acb',
+  'skia_revision': '67ac33e1f1a17a6b1380025ec5b7a455fb082bf4',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.