Add constants and primitive type readonly attributes to Python IDL compiler

Source/bindings/templates/constants.cpp

+{# FIXME: remove all the conditional_string blocks once test removed #}
+{# FIXME: should use reflected_name instead of name #}
+{% macro class_constants() %}
+static const V8DOMConfiguration::ConstantConfiguration {{v8_class_name}}Constants[] = {
+{% for constant in constants %}
+{% if not constant.enabled_at_runtime %}
+{% if constant.conditional_string %}
+#if {{constant.conditional_string}}
+{% endif %}
+    {"{{constant.name}}", {{constant.value}}},
+{% if constant.conditional_string %}
+#endif // {{constant.conditional_string}}
+{% endif %}
+{% endif %}{# not constant.enabled_at_runtime #}
+{% endfor %}
+};
+{% if not do_not_check_constants %}
+
+{% for constant in constants %}
+{% if constant.conditional_string %}
+#if {{constant.conditional_string}}
+{% endif %}
+{# FIXME
+{{cpp_class_name}}Enum{{constant.name_reflect}}IsWrongUseDoNotCheckConstants
+=>
+TheValueOf{{cpp_class_name}}::{{constant.name_reflect}}Doesn'tMatchWithImplementation
+#}
+COMPILE_ASSERT({{constant.value}} == {{cpp_class_name}}::{{constant.reflected_name}}, {{cpp_class_name}}Enum{{constant.reflected_name}}IsWrongUseDoNotCheckConstants);
+{% if constant.conditional_string %}
+#endif // {{constant.conditional_string}}
+{% endif %}
+{% endfor %}
+{% endif %}{# not do_not_check_constants #}
+{% endmacro %}
+
+
+{##############################################################################}
+{% macro install_constants() %}
+{# Runtime-enabled constants #}
+{% for constant in constants %}
+{% if constant.enabled_at_runtime %}
+{% if constant.conditional_string %}
+#if {{constant.conditional_string}}
+{% endif %}
+    if ({{constant.runtime_enable_function_name}}()) {
+        static const V8DOMConfiguration::ConstantConfiguration constantConfiguration = {"{{constant.name}}", static_cast<signed int>({{constant.value}})};
+        V8DOMConfiguration::installConstants(desc, proto, &constantConfiguration, 1, isolate);
+    }
+{% if constant.conditional_string %}
+#endif // {{constant.conditional_string}}
+{%- endif %}
+{% endif %}
+{% endfor %}
+{# Normal (always enabled) constants #}
+    V8DOMConfiguration::installConstants(desc, proto, {{v8_class_name}}Constants, WTF_ARRAY_LENGTH({{v8_class_name}}Constants), isolate);
+{%- endmacro %}