Roll src/third_party/skia 17e3806:f1b7a1d

Roll src/third_party/skia 17e3806:f1b7a1d

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/17e3806..f1b7a1d

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

Commits in this roll:
f1b7a1d bsalomon@google.com Make skpaint->grpaint flow work for composing draws (verts and atlas)
67c6513 reed@google.com EdgeClip demo to show scan-converter clipping behavior

Committed: https://crrev.com/7c1f27fa75c607af584f4361ef02fa8f3e8675ca
Cr-Commit-Position: refs/heads/master@{#351070}

[skia-deps-roller, 2015-09-28 13:31:07]

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

[skia-deps-roller, 2015-09-28 13:31:09]

This roll was created by the Blink AutoRollBot.
    http://www.chromium.org/blink/blinkrollbot

[commit-bot: I haz the power, 2015-09-28 13:32:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1376493002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1376493002/1

[commit-bot: I haz the power, 2015-09-28 14:59:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-28 15:00:57]

Patchset 1 (id:??) landed as
https://crrev.com/7c1f27fa75c607af584f4361ef02fa8f3e8675ca
Cr-Commit-Position: refs/heads/master@{#351070}