Roll src/third_party/skia/ 9ce4110a2..bbb6dc80f (2 commits).

https://chromium.googlesource.com/skia.git/+log/9ce4110a29b0..bbb6dc80fdfe

$ git log 9ce4110a2..bbb6dc80f --date=short --no-merges --format='%ad %ae %s'
2016-01-27 mtklein kill SkValue
2016-01-27 mtklein sketch hooking into PNG_FILTER_OPTIMIZATIONS

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=msarett@google.com

Review URL: https://codereview.chromium.org/1646713002

Cr-Commit-Position: refs/heads/master@{#371927}

DEPS

@@ -39,7 +39,7 @@ 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': '9ce4110a29b02ae3b95903cfbe0e61f31143e66e',
+  'skia_revision': 'bbb6dc80fdfe6ff08cc1abb1a401bd958ced9602',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.