Roll src/third_party/skia/ 675576f02..3ccf2e75e (3 commits).
Roll src/third_party/skia/ 675576f02..3ccf2e75e (3 commits).

https://chromium.googlesource.com/skia.git/+log/675576f023c8..3ccf2e75ed92

$ git log 675576f02..3ccf2e75e --date=short --no-merges --format='%ad %ae %s'
2016-05-06 cdalton Remove hasMixedSamples() from GrPipelineBuilder
2016-05-06 jvanverth Fix for Ubuntu compile warning
2016-05-06 benjaminwagner Disable skia_warnings_as_errors for Fast bot.

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

Review-Url: https://codereview.chromium.org/1950243006
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#392094}

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