Add option to GRIT to provide a resource ordering input file.

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 (required)
@@ skipping 231 matching lines @@
 }
 
 # TODO(aberent): Enable for other platforms once the build machines have
 #                Java on them (and hence can run the closure compiler).
 _strip_resource_files = is_android
 _js_minifier = "//third_party/closure_compiler/js_minify.py"
 
 grit_resource_id_file = "//tools/gritsettings/resource_ids"
 grit_info_script = "//tools/grit/grit_info.py"
 
+grit_predetermined_resource_ids_file = ""
+
+# TODO(asvitkine): Add platform-specific resource id file paths here.
+#                  http://crbug.com/692670
+
 template("grit") {
   assert(defined(invoker.source),
          "\"source\" must be defined for the grit template $target_name")
 
   if (defined(invoker.resource_ids)) {
     resource_ids = invoker.resource_ids
   } else {
     resource_ids = grit_resource_id_file
   }
 
@@ skipping 32 matching lines @@
   }
   if (defined(invoker.grit_flags)) {
     grit_flags += invoker.grit_flags
   }
   if (resource_ids != "") {
     grit_flags += [
       "-f",
       rebase_path(resource_ids, root_build_dir),
     ]
   }
+  if (grit_predetermined_resource_ids_file != "") {
+    grit_flags += [
+      "-p",
+      rebase_path(grit_predetermined_resource_ids_file, root_build_dir),
+    ]
+  }
 
   if (defined(invoker.source_is_generated)) {
     source_is_generated = invoker.source_is_generated
   } else {
     source_is_generated = false
   }
 
   assert_files_flags = []
 
   # We want to make sure the declared outputs actually match what Grit is
@@ skipping 158 matching lines @@
     if (defined(invoker.configs)) {
       configs += invoker.configs
     }
 
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
     output_name = grit_output_name
   }
 }