Only expose Notification.requestPermission() on the Window global.

Source/bindings/templates/interface_base.cpp

 {% include 'copyright_block.txt' %}
 #include "config.h"
 {% filter conditional(conditional_string) %}
 #include "{{v8_class_or_partial}}.h"
 
 {% for filename in cpp_includes if filename != '%s.h' % cpp_class_or_partial %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
@@ skipping 321 matching lines @@
     {% endfilter %}
 
     {% if constructors or has_custom_constructor or has_event_constructor %}
     functionTemplate->SetCallHandler({{v8_class}}::constructorCallback);
     functionTemplate->SetLength({{interface_length}});
     {% endif %}
     v8::Local<v8::ObjectTemplate> instanceTemplate = functionTemplate->InstanceTemplate();
     ALLOW_UNUSED_LOCAL(instanceTemplate);
     v8::Local<v8::ObjectTemplate> prototypeTemplate = functionTemplate->PrototypeTemplate();
     ALLOW_UNUSED_LOCAL(prototypeTemplate);
+    {% if custom_registration_methods %}
+    ExecutionContext* context = currentExecutionContext(isolate);

[Peter Beverloo, 2015/08/28 15:58:58]

This will only be needed for *one* use of |custom_registration_methods| right
now - the one I'm introducing.

I don't know how performance sensitive this is, and would like your guidance on
whether this is OK, or we need more elaborate detection by iterating over
|custom_registration_methods| to determine any needs the context in the bindings
generator.

(Although presumably compilers will optimize this out?)

[haraken, 2015/08/29 08:04:57]

Would you help me understand where the context is used?

In terms of performance overhead, this would be no problem.

+    ALLOW_UNUSED_LOCAL(context);
+    {% endif %}
     {% if has_access_check_callbacks %}
     instanceTemplate->SetAccessCheckCallbacks({{cpp_class}}V8Internal::namedSecurityCheck, {{cpp_class}}V8Internal::indexedSecurityCheck, v8::External::New(isolate, const_cast<WrapperTypeInfo*>(&{{v8_class}}::wrapperTypeInfo)));
     {% endif %}
     {% for attribute in attributes
        if attribute.runtime_enabled_function and
           not attribute.exposed_test %}
     {% filter conditional(attribute.conditional_string) %}
     if ({{attribute.runtime_enabled_function}}()) {
         {% if attribute.is_data_type_property %}
         static const V8DOMConfiguration::AttributeConfiguration attributeConfiguration = \
@@ skipping 138 matching lines @@
 {% endfor %}
 {% for attribute in attributes if attribute.is_implemented_in_private_script %}
 {{attribute_getter_implemented_in_private_script(attribute)}}
 {% if attribute.has_setter %}
 {{attribute_setter_implemented_in_private_script(attribute)}}
 {% endif %}
 {% endfor %}
 {% block partial_interface %}{% endblock %}
 } // namespace blink
 {% endfilter %}