Roll external/skia 8103ecae7..98ad5b7a4 (19 commits)

https://skia.googlesource.com/skia.git/+log/8103ecae7..98ad5b7a4

2018-03-13 ethannicholas@google.com Fixed some shader cache issues
2018-03-13 scroggo@google.com Remove calls to computeOutputColor- Type and Space
2018-03-13 benjaminwagner@google.com Unomit Win Intel Vulkan tests that seem to pass now.
2018-03-13 bungeman@google.com IWYU for some test files starting with 'C'.
2018-03-13 halcanary@google.com scripts to generate [m]skps, documentation
2018-03-13 caryclark@skia.org fix fiddle with blur
2018-03-13 bsalomon@google.com Add testing-only backend render target support to GrVkGpu.
2018-03-13 caryclark@skia.org avoid divide by zero
2018-03-13 brianosman@google.com Remove use of deprecated MakeFromIRect
2018-03-13 mtklein@chromium.org minor style guide updates and editing
2018-03-13 angle-skia-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com Roll skia/third_party/externals/angle2/ 64e5ed2ab..f0b30dd8b (2 commits)
2018-03-13 caryclark@skia.org protect SkPathMeasure against NaN
2018-03-13 brianosman@google.com Revert "Reland "Add SkColorSpaceXform_skcms""
2018-03-13 brianosman@google.com Reland "Add SkColorSpaceXform_skcms"
2018-03-13 bsalomon@google.com Remove yoda rule from style guide
2018-03-13 caryclark@skia.org fix a couple pathops fuzzers
2018-03-13 caryclark@skia.org remove paint flatten unflatten from generated docs
2018-03-13 angle-skia-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com Roll skia/third_party/externals/angle2/ e98b1b5d4..64e5ed2ab (7 commits)
2018-03-13 brianosman@google.com Fix several bugs in SkDebugCanvas/SkDrawCommand

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Test: I5110881203c000474116a94a48f2afc9a9b62001
Bug: 70846442
Change-Id: I1e069aaf8c2fdefe02d6b284102557d71211ff57