Roll src/third_party/skia 5ba50afeed4c..e55e56038cf4 (26 commits)

[skia-flutter-autoroll]

https://skia.googlesource.com/skia.git/+log/5ba50afeed4c..e55e56038cf4

git log 5ba50af..e55e560 --date=short --first-parent --format='%ad %ae %s'
2020-05-01 fmalita@chromium.org Hoist pixel geometry adjustments out of SkBaseDevice::CreateInfo()
2020-05-01 robertphillips@google.com Disable MTLPixelFormatBGR10A2Unorm on iOS
2020-05-01 michaelludwig@google.com Retry drawing the simplified shape
2020-05-01 fmalita@chromium.org [skottie] More accurate contrast effect option
2020-04-30 mtklein@google.com another round of work on fm_driver
2020-04-30 reed@google.com [sksl,skvm] handle more 1,2,3,4 variants
2020-04-30 jvanverth@google.com Add GrD3DDescriptorHeap.
2020-04-30 herb@google.com Const all the things in GrAtlasTextOp
2020-04-30 ethannicholas@google.com SkSL parser now limits recursion on comma operator as well
2020-04-30 bungeman@google.com Add Preview to list of possible MSVC versions.
2020-04-30 michaelludwig@google.com Reland "Refactor geometry union capabilities out of GrStyledShape"
2020-04-30 robertphillips@google.com Add some missed BGRA_1010102 testing tidbits
2020-04-30 brianosman@google.com Enforce C-style identifier rules for matrix markers everywhere
2020-04-30 sgilhuly@chromium.org Dawn: Use shared copy encoder to create backend texture
2020-04-30 csmartdalton@google.com Add a faster, cleaner path iterator
2020-04-30 reed@google.com migrate spiral demo from canvaskit
2020-04-30 senorblanco@chromium.org Dawn: update to BufferCopyView API changes.
2020-04-30 mtklein@google.com Revert "retry absl"
2020-04-30 mtklein@google.com retry absl
2020-04-30 robertphillips@google.com Add BGR_10A2 support to Ganesh (take 2)
2020-04-30 mtklein@google.com update skstd
2020-04-30 ethannicholas@google.com Fixed UB in SkSL constant arithmetic
2020-04-30 mtklein@google.com add fm driver
2020-04-30 brianosman@google.com Add layout(marker) to SkSL
2020-04-30 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/dawn 2d79ef264eba..754c161fd366 (5 commits)
2020-04-30 cwallez@chromium.org Rolling 3 dependencies

Created with:
gclient setdep -r src/third_party/skia@e55e56038cf4

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 ethannicholas@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: ethannicholas@google.com