Merge Chromium src@r53293

Change-Id: Ia79acf8670f385cee48c45b0a75371d8e950af34

1 files changed, 46 insertions, 0 deletions

diff --git a/chrome/browser/resources_util.cc b/chrome/browser/resources_util.cc
new file mode 100644
index 0000000..aefc4e3
--- /dev/null
+++ b/chrome/browser/resources_util.cc
@@ -0,0 +1,46 @@
+// Copyright (c) 2009 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 "chrome/browser/resources_util.h"
+
+#include "base/hash_tables.h"
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "grit/theme_resources_map.h"
+
+#include <utility>
+
+namespace {
+
+// A wrapper class that holds a hash_map between resource strings and resource
+// ids.  This is done so we can use base::LazyInstance which takes care of
+// thread safety in initializing the hash_map for us.
+class ThemeMap {
+ public:
+  typedef base::hash_map<std::string, int> StringIntMap;
+
+  ThemeMap() {
+    for (size_t i = 0; i < kThemeResourcesSize; ++i) {
+      id_map_[kThemeResources[i].name] = kThemeResources[i].value;
+    }
+  }
+
+  int GetId(const std::string& resource_name) {
+    StringIntMap::const_iterator it = id_map_.find(resource_name);
+    if (it == id_map_.end())
+      return -1;
+    return it->second;
+  }
+
+ private:
+  StringIntMap id_map_;
+};
+
+static base::LazyInstance<ThemeMap> g_theme_ids(base::LINKER_INITIALIZED);
+
+}  // namespace
+
+int ResourcesUtil::GetThemeResourceId(const std::string& resource_name) {
+  return g_theme_ids.Get().GetId(resource_name);
+}