Roll src/third_party/skia a6ae14e:1340039

Roll src/third_party/skia a6ae14e:1340039

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/a6ae14e..1340039

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

Commits in this roll:
1340039 rileya@chromium.org Add Rec709 YUV color space support to GrYUVtoRGBEffect.
6531c36 caryclark@google.com Generate platform specific fontmgr gm.
973ae86 emmaleer@google.com removing png_read_end from SkPngScanlineDecoder
85693c1 caryclark@google.com make stroketext textblob* texteffects tileimagefilter gm portable
942930d mtklein@chromium.org 565 support for SIMD xfermodes
1accc4c robertphillips@google.com Fix textureDomain/bleed prevention in msaa

Committed: https://crrev.com/ccfd339e9c906303bd1d30bbcab373462c894d93
Cr-Commit-Position: refs/heads/master@{#339637}

[skia-deps-roller, 2015-07-21 09:45:21]

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

[skia-deps-roller, 2015-07-21 09:45:22]

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

[commit-bot: I haz the power, 2015-07-21 09:45:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1245123002/1

[commit-bot: I haz the power, 2015-07-21 11:13:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-21 11:14:14]

Patchset 1 (id:??) landed as
https://crrev.com/ccfd339e9c906303bd1d30bbcab373462c894d93
Cr-Commit-Position: refs/heads/master@{#339637}