Add dummy BUILDER object to java interfaces.

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

 {% from "constant_definition.tmpl" import constant_def %}
 {% from "enum_definition.tmpl" import enum_def %}
 
 {%- macro declare_params(parameters) %}
 {%-   for param in parameters -%}
 {{param.kind|java_type(False)}} {{param|name}}
 {%- if not loop.last %}, {% endif %}
 {%-   endfor %}
 {%- endmacro %}
 
@@ skipping 17 matching lines @@
 {%- macro super_class(client) -%}
 {%-   if client -%}
 org.chromium.mojo.bindings.InterfaceWithClient<{{client|java_type}}>
 {%-   else -%}
 org.chromium.mojo.bindings.Interface
 {%-   endif -%}
 {%- endmacro -%}
 
 {% macro interface_def(interface, client) %}
 public interface {{interface|name}} extends {{super_class(client)}} {
+
+    public static final Object BUILDER = new Object();
+
 {%  for constant in interface.constants %}
 
     {{constant_def(constant)|indent(4)}}
 {%  endfor %}
 {%  for enum in interface.enums %}
 
     {{enum_def(enum, false)|indent(4)}}
 {% endfor %}
 {% for method in interface.methods %}
 
     void {{method|name}}({{declare_request_params(method)}});
 {%   if method.response_parameters %}
     {{declare_callback(method)|indent(4)}}
 {%   endif %}
 {% endfor %}
 
 }
 {% endmacro %}