Roll src/third_party/skia 8566dda51b42..5f152f07455c (8 commits) (#11241)

https://skia.googlesource.com/skia.git/+log/8566dda51b42..5f152f07455c

git log 8566dda51b42..5f152f07455c --date=short --no-merges --format='%ad %ae %s'
2019-08-19 reed@google.com add path-edger; lightweight Iter for edges
2019-08-19 herb@google.com Use bulk API for bitmap glyph drawing
2019-08-19 csmartdalton@google.com Add GrvkGpuRTCommandBuffer::appendSampledTexture
2019-08-19 brianosman@google.com Temporary Lua hook to measure impact of conservative convexity
2019-08-19 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-08-19 robertphillips@google.com Add textureReleaseProc and releaseContext to SkImage factory functions
2019-08-19 fmalita@chromium.org [skottie] Shaper downscale-to-fit vertical alignment mode
2019-08-19 jlavrova@google.com Fixed temp dir for snapshots

Created with:
  gclient setdep -r src/third_party/skia@5f152f07455c

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

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.

Bug: None
TBR=egdaniel@google.com
https://dart.googlesource.com/external/github.com/flutter/engine/+/f4591a73a5c7ecf6cc3c28ffebcedb70823e2b21
diff --git a/commits.json b/commits.json
index c2c0ad4..9ba8896 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
-  "external/github.com/flutter/engine":"99ee3c2b0df7911baa390fa897cefc836605d154",
+  "external/github.com/flutter/engine":"f4591a73a5c7ecf6cc3c28ffebcedb70823e2b21",
   "external/github.com/flutter/flutter":"4d81b0c9708f57e545e96f0e6817f5eab3fc68ee",
   "sdk":"b52b2c39101794cd215783ba832f121e70fbe5b6"
 }
\ No newline at end of file