Add support for variations controlled overriding UI strings to the variations service.

chrome/browser/metrics/variations/generate_resources_map.py

 #!/usr/bin/python
 # 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.
 
 import collections
 import hashlib
 import operator
 import os
 import re
@@ skipping 138 matching lines @@
   indices_array = _GenDataArray(
       hashed_tuples, "    %s,  // %s", 'kResourceIndices', 'int',
       operator.attrgetter('index'))
 
   return (
       "// This file was generated by generate_resources_map.py. Do not edit.\n"
       "\n\n"
       "#include "
       "\"chrome/browser/metrics/variations/generated_resources_map.h\"\n\n"
       "namespace chrome_variations {\n\n"
+      "const size_t kNumResources = %i;\n\n"
       "%s"
       "\n"
       "%s"
       "\n"
-      "}  // namespace chrome_variations\n") % (hashes_array, indices_array)
+      "}  // namespace chrome_variations\n") % (
+          len(hashed_tuples), hashes_array, indices_array)
 
 
 def main(resources_file, map_file):
   generated_resources_h = ""
   with open(resources_file, "r") as resources:
     generated_resources_h = resources.read()
 
   if len(generated_resources_h) == 0:
     raise Error("No content loaded for %s." % (resources_file))
 
   file_content = _GenerateFileContent(generated_resources_h)
 
   with open(map_file, "w") as generated_file:
     generated_file.write(file_content)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1], sys.argv[2]))