Roll Skia from b7e826d5324f to 15de7f9c3b3b (3 revisions)

https://skia.googlesource.com/skia.git/+log/b7e826d5324f..15de7f9c3b3b

2023-08-29 bungeman@google.com Roll HarfBuzz from f94508ed to f380a328 (164 commits)
2023-08-29 skia-autoroll@skia-public.iam.gserviceaccount.com Roll skottie-base from d5998642c25b to 3e2b0ed75e49
2023-08-29 michaelludwig@google.com Reland "[skif] Add FilterResult::Builder::blur() to wrap per-backend blur impls"

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 aaclarke@google.com,brianosman@google.com,jlavrova@google.com,rmistry@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Skia: https://bugs.chromium.org/p/skia/issues/entry
To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

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/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -18,7 +18,7 @@ vars = {
   'llvm_git': 'https://llvm.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': 'b7e826d5324f8deeff07f71cf6f8ef334c0907de',
+  'skia_revision': '15de7f9c3b3b0a1290e72a56c63871752cbca9ab',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: c62efc4356bd19b0d2478918cc4a7697
+Signature: af54ce91573f141e36dc2c5ce7eb1e96
 
 ====================================================================================================
 LIBRARY: etc1