bindings: Support sequence in callback function arguments

third_party/WebKit/Source/bindings/templates/callback_function.cpp.tmpl

 {% from 'utilities.cpp.tmpl' import v8_value_to_local_cpp_value %}
 {% filter format_blink_cpp_source_code %}
 
 {% include 'copyright_block.txt' %}
 
 #include "{{v8_class}}.h"
 
 {% for filename in cpp_includes %}
 #include "{{filename}}"
 {% endfor %}
@@ skipping 11 matching lines @@
 {
 }
 
 bool {{v8_class}}::call({{argument_declarations | join(', ')}})
 {
     if (!scriptState->contextIsValid())
         return false;
 
     if (m_callback.isEmpty())
         return false;
+
     ScriptState::Scope scope(scriptState);
 
     {% for argument in arguments %}
     v8::Local<v8::Value> {{argument.argument_name}} = {{argument.cpp_value_to_v8_value}};
     {% endfor %}
 
     v8::Local<v8::Value> thisValue = toV8(scriptWrappable, scriptState->context()->Global(), scriptState->isolate());
 
     {% if arguments %}
     v8::Local<v8::Value> argv[] = { {{arguments | join(', ', 'argument_name')}} };
@@ skipping 13 matching lines @@
         returnValue = cppValue;
         {% endif %}
         return true;
     }
     return false;
 }
 
 } // namespace blink
 
 {% endfilter %}{# format_blink_cpp_source_code #}