Roll external/skia c8167f167..4b0b00e0c (6 commits)
https://skia.googlesource.com/skia.git/+log/c8167f167..4b0b00e0c
2017-06-05 scroggo@google.com Support passing single SKP to get_images_from_skps
2017-06-05 reed@google.com add testing flag to force rasterpipeline
2017-06-05 robertphillips@google.com Make instantiate return a Boolean
2017-06-05 mtklein@chromium.org have start_pipeline() return limit again
2017-06-05 mtklein@chromium.org implement SkRasterPipelineBlitter::blitAntiH2()
2017-06-05 robertphillips@google.com Re-enable single channel renderability for ANGLE ES2
Test: Presubmit checks will test this change.
Change-Id: Icc62ea93320fcddd0e99ccb9cf661196838d9c20