Roll src/third_party/skia/ bc7a4fb06..7717d4a34 (4 commits).

Roll src/third_party/skia/ bc7a4fb06..7717d4a34 (4 commits).

https://skia.googlesource.com/skia.git/+log/bc7a4fb06780..7717d4a343ba

$ git log bc7a4fb06..7717d4a34 --date=short --no-merges --format='%ad %ae %s'
2017-01-24 reed conservativelyContainsRect is asserting
2017-01-23 msarett Add F16 and gamma correct support to webp encoder
2017-01-24 reed restore bool version of clip-bounds
2017-01-23 msarett Reenable index8 dsts


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=ethannicholas@google.com

[skia-deps-roller, 2017-01-24 16:39:01]

The CQ bit was checked by skia-deps-roller@chromium.org

[commit-bot: I haz the power, 2017-01-24 16:39:12]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-24 16:43:28]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-01-24 16:43:29]

Try jobs failed on following builders:
  android_clang_dbg_recipe on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clan...)

[skia-deps-roller, 2017-01-24 16:43:31]

Commit queue failed; closing this roll.