Add interface versioning. Methods queryVersion and requireVersion.

mojo/public/tools/bindings/generators/js_templates/interface_definition.tmpl

 {%- for method in interface.methods %}
   var k{{interface.name}}_{{method.name}}_Name = {{method.ordinal}};
 {%- endfor %}
 
   function {{interface.name}}Ptr(handleOrPtrInfo) {
     this.ptr = new bindings.InterfacePtrController({{interface.name}},
                                                    handleOrPtrInfo);
   }
 
   function {{interface.name}}Proxy(receiver) {
@@ skipping 151 matching lines @@
 {%-   endfor %}
     }
     if (paramsClass === null)
       return validator.validationError.NONE;
     return paramsClass.validate(messageValidator, messageValidator.message.getHeaderNumBytes());
 {%- endif %}
   }
 
   var {{interface.name}} = {
     name: '{{namespace|replace(".","::")}}::{{interface.name}}',
+    kVersion: {{interface.version}},
     ptrClass: {{interface.name}}Ptr,
     proxyClass: {{interface.name}}Proxy,
     stubClass: {{interface.name}}Stub,
     validateRequest: validate{{interface.name}}Request,
 {%- if interface|has_callbacks %}
     validateResponse: validate{{interface.name}}Response,
 {%- else %}
     validateResponse: null,
 {%- endif %}
   };
 {#--- Interface Constants #}
 {%- for constant in interface.constants %}
   {{interface.name}}.{{constant.name}} = {{constant.value|expression_to_text}},
 {%-   endfor %}
 {#--- Interface Enums #}
 {%- from "enum_definition.tmpl" import enum_def -%}
 {%- for enum in interface.enums %}
   {{ enum_def("%s.%s"|format(interface.name, enum.name), enum) }}
 {%-  endfor %}
   {{interface.name}}Stub.prototype.validator = validate{{interface.name}}Request;
 {%- if interface|has_callbacks %}
   {{interface.name}}Proxy.prototype.validator = validate{{interface.name}}Response;
 {%- else %}
   {{interface.name}}Proxy.prototype.validator = null;
 {%- endif %}