Mojo JS bindings: change module loading solution.

mojo/public/tools/bindings/mojom.gni

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 declare_args() {
   # Indicates whether typemapping should be supported in this build
   # configuration. This may be disabled when building external projects which
   # depend on //mojo but which do not need/want all of the Chromium tree
   # dependencies that come with typemapping.
   #
@@ skipping 116 matching lines @@
 #       If set to true, generated classes will use base::OnceCallback instead of
 #       base::RepeatingCallback.
 #       Default value is false.
 #       TODO(dcheng):
 #           - Convert everything to use OnceCallback.
 #           - Remove support for the old mode.
 #
 #   cpp_only (optional)
 #       If set to true, only the C++ bindings targets will be generated.
 #
+#   use_new_js_bindings (optional)
+#       If set to true, the generated JS code will use the new module loading
+#       approach and the core API exposed by Web IDL.
+#
+#       TODO(yzshen): Switch all existing users to use_new_js_bindings=true and
+#       remove the old mode.
+#
 # The following parameters are used to support the component build. They are
 # needed so that bindings which are linked with a component can use the same
 # export settings for classes. The first three are for the chromium variant, and
 # the last three are for the blink variant.
 #   export_class_attribute (optional)
 #       The attribute to add to the class declaration. e.g. "CONTENT_EXPORT"
 #   export_define (optional)
 #       A define to be added to the source_set which is needed by the export
 #       header. e.g. "CONTENT_IMPLEMENTATION=1"
 #   export_header (optional)
@@ skipping 280 matching lines @@
               invoker.export_class_attribute,
               "--export_header",
               invoker.export_header,
             ]
           }
         }
 
         if (defined(invoker.use_once_callback) && invoker.use_once_callback) {
           args += [ "--use_once_callback" ]
         }
+
+        if (defined(invoker.use_new_js_bindings) &&
+            invoker.use_new_js_bindings) {
+          args += [ "--use_new_js_bindings" ]
+        }
       }
     }
 
     action(type_mappings_target_name) {
       inputs = _bindings_configuration_files
       outputs = [
         type_mappings_path,
       ]
       script = "$mojom_generator_root/generate_type_mappings.py"
       deps = []
@@ skipping 193 matching lines @@
           full_name = get_label_info(d, "label_no_toolchain")
           deps += [ "${full_name}_java" ]
         }
 
         srcjar_deps = [ ":$java_srcjar_target_name" ]
         run_findbugs_override = false
       }
     }
   }
 }