Disallow certain blocking DOM calls during microtask execution.

third_party/WebKit/Source/bindings/scripts/v8_methods.py

Index: third_party/WebKit/Source/bindings/scripts/v8_methods.py
diff --git a/third_party/WebKit/Source/bindings/scripts/v8_methods.py b/third_party/WebKit/Source/bindings/scripts/v8_methods.py
index 5e5f348ff99add58e59490e55b0fe0448c43b720..bb22bda55d05616f59e39be8ce128f7444b65f73 100644
--- a/third_party/WebKit/Source/bindings/scripts/v8_methods.py
+++ b/third_party/WebKit/Source/bindings/scripts/v8_methods.py
@@ -179,6 +179,7 @@ def method_context(interface, method, is_visible=True):
         'number_of_required_or_variadic_arguments': len([
             argument for argument in arguments
             if not argument.is_optional]),
+        'not_during_microtasks': 'NotDuringMicrotasks' in extended_attributes,
         'on_instance': v8_utilities.on_instance(interface, method),
         'on_interface': v8_utilities.on_interface(interface, method),
         'on_prototype': v8_utilities.on_prototype(interface, method),