Port messages sent by WebIDBFactoryImpl to Mojo.

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.
 
 mojom_generator_root = "//mojo/public/tools/bindings"
 mojom_generator_script = "$mojom_generator_root/mojom_bindings_generator.py"
 mojom_generator_sources = [
   "$mojom_generator_root/generators/mojom_cpp_generator.py",
   "$mojom_generator_root/generators/mojom_js_generator.py",
   "$mojom_generator_root/generators/mojom_java_generator.py",
@@ skipping 191 matching lines @@
       # //mojo/something:something and we can append shared_cpp_sources_suffix
       # to get the cpp dependency name.
       full_name = get_label_info("$d", "label_no_toolchain")
       public_deps += [ "${full_name}_${shared_cpp_sources_suffix}" ]
     }
   }
 
   # Generate code for variants.
   foreach(bindings_configuration, _bindings_configurations) {
     cpp_only = false
+    if (defined(invoker.cpp_only)) {

[Ken Rockot(use gerrit already), 2016/09/28 20:06:44]

Oh, I thought we had already exposed this. Can you please briefly document this
at the top of the GNI along with the other variables?

[Reilly Grant (use Gerrit), 2016/09/29 06:44:50]

Done.

+      cpp_only = invoker.cpp_only
+    }
     variant_suffix = ""
     if (defined(bindings_configuration.variant)) {
       variant = bindings_configuration.variant
       variant_suffix = "_${variant}"
       cpp_only = true
     }
     type_mappings_target_name = "${target_name}${variant_suffix}__type_mappings"
     type_mappings_path =
         "$target_gen_dir/${target_name}${variant_suffix}__type_mappings"
     active_typemaps = []
@@ skipping 304 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
       }
     }
   }
 }