Roll external/skia 6382f455f..be8ad45fc (8 commits)
https://skia.googlesource.com/skia.git/+log/6382f455f..be8ad45fc
2017-08-11 benjaminwagner@google.com Omit failing test for IntelIris640 Ubuntu Vulkan.
2017-08-11 djsollen@google.com Avoid converting drawImage/drawImageRect into drawBitmap calls
2017-08-11 bsalomon@google.com Remove CHECK_SHOULD_DRAW from SkGpuDevice
2017-08-11 herb@google.com SkSafeMath for tracking size_t overflow
2017-08-11 liyuqian@google.com Don't store clipped x which could break edge order
2017-08-11 mtklein@chromium.org remove monobench
2017-08-11 benjaminwagner@google.com Add new Linux IntelIris640 jobs.
2017-08-11 mtklein@chromium.org remove mask load() and store()
Test: Presubmit checks will test this change.
Change-Id: I91cb151e4e971bcc5e511e65e102a5c18fab740b