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

chrome/browser/metrics/variations/generated_resources_map.h

 // 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.
 
 #ifndef CHROME_BROWSER_METRICS_VARIATIONS_GENERATED_RESOURCES_MAP_H_
 #define CHROME_BROWSER_METRICS_VARIATIONS_GENERATED_RESOURCES_MAP_H_
 
 #include "base/basictypes.h"
 
 namespace chrome_variations {
 
 // This file provides a mapping from hashes of generated resource names to their
 // IDs. This mapping is achieved by having two arrays: |kResourceHashes|, a
 // sorted array of resource name hashes; and |kResourceIndices|, an array of
 // resource indices in the same order as |kResourceHashes|. So, if
 // generated_resources.h contains |#define IDS_FOO 12345|, then for some index i
-// kResourceHashes[i] = HASH("IDS_FOO") and kResourceIndices[i] = 12345.
+// kResourceHashes[i] = HASH("IDS_FOO") and kResourceIndices[i] = 12345. Both
+// arrays are of length |kNumResources|.
 
 // The definitions of the arrays are generated by generate_resources_map.py from
 // the content of generated_resources.h.
 
+// Length of |kResourceHashes| and |kResourceIndices|.
+extern const size_t kNumResources;
+
 // A sorted array of hashed generated resource names.
 extern const uint32_t kResourceHashes[];
 
 // An array of generated resource indices. The order of this array corresponds
 // to the order of |kResourceHashes|.
 extern const int kResourceIndices[];
 
+// Gets the resource index corresponding to the given hash.
+int GetResourceIndex(uint32_t hash);
+
 }  // namespace chrome_variations
 
 #endif  // CHROME_BROWSER_METRICS_VARIATIONS_GENERATED_RESOURCES_MAP_H_