Fix mojom_ts_generator.py error with Python 3.11

patch/patch.cfg

@@ -706,5 +706,10 @@ patches = [
     # windows: Fix implicit conversion error when building cef_sandbox.
     # https://chromium-review.googlesource.com/c/chromium/src/+/5120035
     'name': 'base_allocator_5120035'
+  },
+  {
+    # Fix mojom_ts_generator.py error with Python 3.11.
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=1422178
+    'name': 'mojo_generator_1422178'
   }
 ]

patch/patches/mojo_generator_1422178.patch

@@ -0,0 +1,13 @@
+diff --git mojo/public/tools/bindings/generators/mojom_ts_generator.py mojo/public/tools/bindings/generators/mojom_ts_generator.py
+index 98516f03276e4..a1bda9c021c52 100644
+--- mojo/public/tools/bindings/generators/mojom_ts_generator.py
++++ mojo/public/tools/bindings/generators/mojom_ts_generator.py
+@@ -177,6 +177,8 @@ def _GetWebUiModulePath(module):
+   path = module.metadata.get('webui_module_path')
+   if path is None or path == '/':
+     return path
++  if path == '':
++    return '/'
+   if _IsAbsoluteChromeResourcesPath(path):
+     return path.rstrip('/') + '/'
+   return '/{}/'.format(path.strip('/'))