Roll src/third_party/skia/ 6e7025ab1..94b87bd40 (5 commits).
Roll src/third_party/skia/ 6e7025ab1..94b87bd40 (5 commits).

https://chromium.googlesource.com/skia.git/+log/6e7025ab13df..94b87bd404d7

$ git log 6e7025ab1..94b87bd40 --date=short --no-merges --format='%ad %ae %s'
2016-04-04 halcanary DM/PDF: stop adding unused rasterizer keywords
2016-04-04 bsalomon Revert of Rename enums in GrContextFactory to remove "GL" (patchset #4 id:60001 of https://codereview.chromium.org/1845923004/ )
2016-04-04 robertphillips Revert of Switch SkDownSampleImageFilter over to new onFilterImage interface (patchset #6 id:100001 of https://codereview.chromium.org/1851583002/ )
2016-04-04 robertphillips Update internal testing ImageFilters to sk_sp
2016-04-04 robertphillips Switch SkDownSampleImageFilter over to new onFilterImage interface

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

Review URL: https://codereview.chromium.org/1856723002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#384902}

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