Roll src/third_party/skia/ d9f5d20f8..959a2937d (2 commits).
Roll src/third_party/skia/ d9f5d20f8..959a2937d (2 commits).

https://chromium.googlesource.com/skia.git/+log/d9f5d20f81b1..959a2937d552

$ git log d9f5d20f8..959a2937d --date=short --no-merges --format='%ad %ae %s'
2016-05-05 reed Revert of SkOncePtr -> SkOnce (patchset #1 id:1 of https://codereview.chromium.org/1949313003/ )
2016-05-05 reed Reland of SkOncePtr -> SkOnce (patchset #1 id:1 of https://codereview.chromium.org/1945293004/ )

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

Review-Url: https://codereview.chromium.org/1953703002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#391784}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk