First pass on adding a chrome/browser GN target.

build/secondary/tools/grit/grit_rule.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.
 
 # Instantiate grit. This will produce a script target to run grit, and a
 # static library that compiles the .cc files.
 #
 # Parameters
 #
 #   source
@@ skipping 36 matching lines @@
     "-E", "ANDROID_JAVA_TAGGED_ONLY=true",
   ]
 }
 
 if (enable_extensions) {
   grit_defines += [ "-D", "enable_extensions" ]
 }
 if (enable_plugins) {
   grit_defines += [ "-D", "enable_plugins" ]
 }
+if (enable_task_manager) {
+  grit_defines += [ "-D", "enable_task_manager" ]
+}
+if (enable_app_list) {
+  grit_defines += [ "-D", "enable_app_list" ]
+}
+if (enable_service_discovery) {
+  grit_defines += [ "-D", "enable_service_discovery" ]
+}
+if (enable_wifi_bootstrapping) {
+  grit_defines += [ "-D", "enable_wifi_bootstrapping" ]
+}
 
 # TODO(GYP) the rest of the grit_defines from the gyp build.
 
 grit_resource_id_file = "//tools/gritsettings/resource_ids"
 grit_info_script = "//tools/grit/grit_info.py"
 
 template("grit") {
   assert(defined(invoker.source),
          "\"source\" must be defined for the grit template $target_name")
   assert(!defined(invoker.sources) && !defined(invoker.outputs),
@@ skipping 77 matching lines @@
     direct_dependent_configs = [ ":$grit_config" ]
 
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
     if (defined(invoker.output_name)) {
       output_name = invoker.output_name
     }
   }
 }