Mojo JS bindings: introduce concepts that are more similar to C++ bindings:

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() {
+    this.ptr = new bindings.InterfacePtrController({{interface.name}});
+  }
+
   function {{interface.name}}Proxy(receiver) {
     bindings.ProxyBase.call(this, receiver);
   }
   {{interface.name}}Proxy.prototype = Object.create(bindings.ProxyBase.prototype);
 
 {%- for method in interface.methods %}
+  {{interface.name}}Ptr.prototype.{{method.name|stylize_method}} = function() {
+    return {{interface.name}}Proxy.prototype.{{method.name|stylize_method}}
+        .apply(this.ptr.connection.remote, arguments);
+  };
+
   {{interface.name}}Proxy.prototype.{{method.name|stylize_method}} = function(
 {%- for parameter in method.parameters -%}
 {{parameter.name}}{% if not loop.last %}, {% endif %}
 {%- endfor -%}
 ) {
     var params = new {{interface.name}}_{{method.name}}_Params();
 {%- for parameter in method.parameters %}
     params.{{parameter.name}} = {{parameter|js_proxy_method_parameter_value}};
 {%- endfor %}
 
@@ skipping 158 matching lines @@
 {%- 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 %}