Roll external/skia d401da64f..cb1393585 (19 commits)

https://skia.googlesource.com/skia.git/+log/d401da64f..cb1393585

2018-05-04 bungeman@google.com Allow finer rotation in Viewer app.
2018-05-04 robertphillips@google.com Revert "Fix a bug in SkGpuBlurUtils::GaussianBlur (take 2)"
2018-05-04 bsalomon@google.com Remove unused SK_DISABLE_ARC_TO_LINE_TO_CHECK build flag
2018-05-04 bsalomon@google.com Remove could not invert matrix SkDebugfs
2018-05-04 mtklein@chromium.org Don't use getDeviceClipBounds() to bound pic ops.
2018-05-04 herb@google.com Remove android specific code
2018-05-04 bungeman@google.com Avoid drawing BW clipped color glyphs many times.
2018-05-04 fmalita@chromium.org [skottie] Disable on Android Framework builds
2018-05-04 borenet@google.com [recipes] Remove core.setup()
2018-05-04 robertphillips@google.com Make degenerate kernel in fill_in_2D_gaussian_kernel sum to 1
2018-05-04 robertphillips@google.com Fix a bug in SkGpuBlurUtils::GaussianBlur (take 2)
2018-05-04 caryclark@google.com Revert "Reland "remove obsolete color defines""
2018-05-04 bsalomon@google.com Make RenderDoc work automatically with GLX viewer
2018-05-04 caryclark@google.com Reland "remove obsolete color defines"
2018-05-04 bsalomon@google.com Make the src rects of truths in SkLatticeIter be integral.
2018-05-04 halcanary@google.com SkExecutor: use SkLeanWindows.h
2018-05-04 borenet@google.com [infra] Remove PDFium bot and associated recipe code
2018-05-04 skcms-skia-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com Roll skia/third_party/skcms cc1799c..02fc32e (1 commits)
2018-05-04 benjaminwagner@google.com Remove fCacheKeys from SkImageFilter.

The AutoRoll server is located here: https://android-roll.skia.org

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

Test: Presubmit checks will test this change.
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.

Bug: 77917978
Change-Id: Ifb785b4782a62321f217cf5642bd01cd5e486be3