Roll src/third_party/skia/ e02d3caab..a4cb388c0 (1 commit).

https://skia.googlesource.com/skia.git/+log/e02d3caab823..a4cb388c0fe8

$ git log e02d3caab..a4cb388c0 --date=short --no-merges --format='%ad %ae %s'
2016-12-29 brianosman Revert "Add ImageToColorSpace helper in SkImageFilter"

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=liyuqian@google.com

Review-Url: https://codereview.chromium.org/2608663002
Cr-Commit-Position: refs/heads/master@{#440932}

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': 'e02d3caab823728d3106bcb1d4fbb674afc959fb',
+  'skia_revision': 'a4cb388c0fe83de153806cbe42e4b7d47a069c09',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.