Roll Skia from d8ec08c6d49d to b708dd7d1092 (1 revision) (flutter/engine#46518)

https://skia.googlesource.com/skia.git/+log/d8ec08c6d49d..b708dd7d1092

2023-10-03 lehoangquyen@chromium.org graphite-dawn: only wait for wgpu::RenderPipeline on 1st use

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 brianosman@google.com,chinmaygarde@google.com,djsollen@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

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': 'd8ec08c6d49de02491f35bc58339f0827adf3d14',
+  'skia_revision': 'b708dd7d109232f6e9c7eb6823eed5f5959dfa09',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: a6371a6ee8721a9b184426132ac1c7a7
+Signature: 4015261b075c10fefce9e2201da110d9
 
 ====================================================================================================
 LIBRARY: etc1