Roll external/skia 288d041c6..243ed3755 (5 commits)
https://skia.googlesource.com/skia.git/+log/288d041c6..243ed3755
2017-05-05 scroggo@google.com Remove unnecessary non-UTF8 character
2017-05-05 csmartdalton@google.com Add postFlush call to GrOnFlushCallbackObject
2017-05-05 msarett@google.com Avoid interpolating color lut with less than 2 points
2017-05-05 halcanary@google.com SkDiscardableMemoryPool: always have a mutex for testing
2017-05-05 egdaniel@google.com Split tracking of TexelBuffers from normal samplers
Test: Presubmit checks will test this change.
Change-Id: Icffa3944ac018671e3d91923048e89231922664e