Allow embedders to share code to override UI strings.

components/variations/service/ui_string_overrider.cc

Index: components/variations/service/ui_string_overrider.cc
diff --git a/components/variations/service/ui_string_overrider.cc b/components/variations/service/ui_string_overrider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ec573f521f833c24214859080b8b9fd8e8f2899d
--- /dev/null
+++ b/components/variations/service/ui_string_overrider.cc
@@ -0,0 +1,51 @@
+// Copyright 2015 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.
+
+#include "components/variations/service/ui_string_overrider.h"
+
+#include <algorithm>
+
+#include "base/logging.h"
+#include "ui/base/resource/resource_bundle.h"
+
+namespace variations {
+
+UIStringOverrider::UIStringOverrider()
+    : resource_hashes_(nullptr),
+      resource_indices_(nullptr),
+      num_resources_(0) {}
+
+UIStringOverrider::UIStringOverrider(const uint32_t* resource_hashes,
+                                     const int* resource_indices,
+                                     size_t num_resources)
+    : resource_hashes_(resource_hashes),
+      resource_indices_(resource_indices),
+      num_resources_(num_resources) {
+  DCHECK(!num_resources || resource_hashes_);
+  DCHECK(!num_resources || resource_indices_);
+}
+
+UIStringOverrider::~UIStringOverrider() {}
+
+int UIStringOverrider::GetResourceIndex(uint32_t hash) {
+  if (!num_resources_)
+    return -1;
+  const uint32_t* end = resource_hashes_ + num_resources_;
+  const uint32_t* element = std::lower_bound(resource_hashes_, end, hash);
+  if (element == end || *element != hash)
+    return -1;
+  return resource_indices_[element - resource_hashes_];
+}
+
+void UIStringOverrider::OverrideUIString(uint32_t hash,
+                                         const base::string16& string) {
+  int resource_id = GetResourceIndex(hash);
+  if (resource_id == -1)
+    return;
+
+  ui::ResourceBundle::GetSharedInstance().OverrideLocaleStringResource(
+      resource_id, string);
+}
+
+}  // namespace variations