Roll src/third_party/skia ccca30aad770..6344c2937997 (13 commits)

[skia-flutter-autoroll]

https://skia.googlesource.com/skia.git/+log/ccca30aad770..6344c2937997

git log ccca30a..6344c29 --date=short --first-parent --format='%ad %ae %s'
2019-12-04 reed@google.com some cleanups for halfplanes
2019-12-04 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-12-04 egdaniel@google.com Remove unneeded abandon/release check in GrGpuResource message processing.
2019-12-04 bsalomon@google.com Remove SkSize& SkSize::operator=(const SkISize&)
2019-12-04 halcanary@google.com SkQP: model-creation improvements
2019-12-04 mtklein@google.com work around GCC false positive warning?
2019-12-04 egdaniel@google.com Handle failures in submission of vulkan command buffers.
2019-12-04 mtklein@google.com replace SkIRect[1] with SkIRect
2019-12-04 bsalomon@google.com Fix for 420/422 chroma subsampling of odd dimension images when converting from YUV to RGB on GPU.
2019-12-04 reed@google.com Reland "remove legacy SkPath enum guards"
2019-12-04 robertphillips@google.com Add onPrePrepareDraws to GrFillRectOp
2019-12-04 mtklein@google.com simpler tmp arrays in GrGLPath
2019-12-04 senorblanco@chromium.org Update dawn.h -> webgpu.h, dawn_cpp.h -> webgpu_cpp.h.

Created with:
gclient setdep -r src/third_party/skia@6344c2937997

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC bsalomon@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

Bug: None
Tbr: bsalomon@google.com

[skia-flutter-autoroll]

Auto-roller completed checks. About to merge.