Roll external/skia f57c6de78..e4679fa06 (8 commits)
https://skia.googlesource.com/skia.git/+log/f57c6de78..e4679fa06
2017-09-29 csmartdalton@google.com CCPR: Blacklist Mali GPUs and Vulkan while we work through issues
2017-09-29 kjlubick@google.com Add coverage related binaries to clang_linux asset
2017-09-29 egdaniel@google.com Fall back to non mipped Texture when we can't copy base to mipped texture
2017-09-29 caryclark@skia.org fix setPixelRef
2017-09-29 mtklein@chromium.org ok, add a8 dst support
2017-09-29 robertphillips@google.com Add unit test for pinned SkImages
2017-09-29 egdaniel@google.com Remove unused outOffset param in GrTextureAdjuster
2017-09-29 recipe-roller@chromium.org Roll recipe dependencies (trivial).
Test: Presubmit checks will test this change.
Change-Id: I2806fa03ee4c5d7a25c10e816fc50c4483aa2c44
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