Roll Skia from 540d76ea74f8 to db4a29e0689e (2 revisions) (#48633)

https://skia.googlesource.com/skia.git/+log/540d76ea74f8..db4a29e0689e

2023-12-04 briansalomon@gmail.com Fix DawnBuffer map at creation on WebGPU.
2023-12-04 michaelludwig@google.com [skif] Check AutoSurface for empty bounds

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,matanl@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://issues.skia.org/issues/new?component=1389291&template=1850622

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': '540d76ea74f84473839fdebe0fb3ca4a55d8c6dd',
+  'skia_revision': 'db4a29e0689e4aa40aec39713bf901a9e08a2b14',
 
   # 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: e030d4413fb5b74aa9c115a6840931b2
+Signature: e51c23730da800ea6e1cb6d189bad2e9
 
 ====================================================================================================
 LIBRARY: etc1