Roll external/skia 81e7bf8d6..af1813e3b (16 commits)
https://skia.googlesource.com/skia.git/+log/81e7bf8d6..af1813e3b
2017-07-20 scroggo@google.com Update call to new signature of wrapBackendTexture
2017-07-20 egdaniel@google.com Fix WrappedProxyTest for sample count change
2017-07-20 egdaniel@google.com Revert "Revert "Fixes from sample count change""
2017-07-20 egdaniel@google.com Revert "Fixes from sample count change"
2017-07-20 caryclark@google.com Revert "Revert "Fixes from sample count change""
2017-07-20 caryclark@google.com Revert "Fixes from sample count change"
2017-07-20 reed@google.com Assume HQ is handled by pipeline, delete legacy code-path
2017-07-20 brianosman@google.com Strip out unused tracing macros
2017-07-20 bsalomon@google.com Remove GrBackendTextureDesc
2017-07-20 halcanary@google.com SkPDF: minor cleanups of skpdfdevice
2017-07-19 halcanary@google.com SkPDF: SkPDFMakeShader takes the paint color.
2017-07-19 reed@google.com removed dead colortable code
2017-07-19 bsalomon@google.com Make GrPipeline non-refcounted
2017-07-19 mtklein@chromium.org Tweak HWCAP_... names to avoid clash with hwcap.h
2017-07-19 halcanary@google.com Add Alpha Image GM
2017-07-19 egdaniel@google.com Fixes from sample count change
Test: Presubmit checks will test this change.
Change-Id: Iaef73f671f4c2a291a4ad49695fbfcfae496e209