Make mojo/services pass in "gn check"

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.
 
 # Generate C++ and JavaScript source files from mojom files. The output files
 # will go under the generated file directory tree with the same path as each
 # input file.
 #
 # Parameters:
 #
 #   sources (required)
 #       List of source .mojom files to compile.
 #
 #   deps (optional)
-#
+#   public_deps (optional)
 #   visibility (optional)
-#       Normal meaning. However, this must be a list (normal visibility
-#       allows a single string).
 template("mojom") {
   assert(defined(invoker.sources),
          "\"sources\" must be defined for the $target_name template.")
 
   generator_root = "//mojo/public/tools/bindings"
   generator_script = "$generator_root/mojom_bindings_generator.py"
   generator_sources = [
     generator_script,
     "$generator_root/generators/cpp_templates/enum_declaration.tmpl",
     "$generator_root/generators/cpp_templates/interface_declaration.tmpl",
@@ skipping 49 matching lines @@
     "{{source_gen_dir}}/{{source_name_part}}_mojom.py",
   ]
 
   if (defined(invoker.visibility)) {
     # Need to save this because the the target_name is overwritten inside the
     # action to be that of the action itself. Only define this in the case the
     # var is used to avoid unused var error.
     target_visibility = [ ":$target_name" ]
   }
 
-  generator_target_name = target_name + "_generator"
+  generator_target_name = target_name + "__generator"
   action_foreach(generator_target_name) {
     if (defined(invoker.visibility)) {
       visibility = target_visibility + invoker.visibility
     }
     script = generator_script
     inputs = generator_sources
     sources = invoker.sources
     outputs = generator_cpp_outputs +
               generator_js_outputs +
               generator_python_outputs
@@ skipping 12 matching lines @@
     }
     sources = process_file_template(invoker.sources, generator_cpp_outputs)
     data = process_file_template(invoker.sources, generator_js_outputs)
     deps = [
       ":$generator_target_name",
       "//mojo/public/cpp/bindings",
     ]
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
+    if (defined(invoker.public_deps)) {
+      public_deps = invoker.public_deps
+    }
   }
 }