Add Chromium-only Blender WebEngine parity work

blender-5.2.0/doc/python_api/examples/bpy.props.4.py

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+"""
+Update Example
+++++++++++++++
+
+It can be useful to perform an action when a property is changed and can be
+used to update other properties or synchronize with external data.
+
+All properties define update functions except for CollectionProperty.
+
+.. warning::
+
+   Remember that these callbacks may be executed in threaded context.
+
+.. warning::
+
+   If the property belongs to an Operator, the update callback's first
+   parameter will be an OperatorProperties instance, rather than an instance
+   of the operator itself. This means you can't access other internal functions
+   of the operator, only its other properties.
+
+"""
+
+import bpy
+
+
+def update_func(self, context):
+    print("my test function", self)
+
+
+bpy.types.Scene.testprop = bpy.props.FloatProperty(update=update_func)
+
+bpy.context.scene.testprop = 11.0
+
+# >>> my test function <bpy_struct, Scene("Scene")>