Roll src/third_party/skia/ f6a84bdb4..06604b956 (2 commits).
Roll src/third_party/skia/ f6a84bdb4..06604b956 (2 commits).

https://chromium.googlesource.com/skia.git/+log/f6a84bdb477f..06604b956223

$ git log f6a84bdb4..06604b956 --date=short --no-merges --format='%ad %ae %s'
2016-02-05 cdalton Add GL indirect drawing APIs
2016-02-05 cdalton Add support for GL_EXT_raster_multisample

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

Review URL: https://codereview.chromium.org/1670273002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#373896}

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