Add localized default audio device names.

media/base/media_resources.cc

+// 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 "base/lazy_instance.h"
+#include "base/strings/utf_string_conversions.h"
+#include "media/base/media_resources.h"
+
+namespace media {
+
+static base::LazyInstance<LocalizedStringProvider>::Leaky
+    g_localized_string_provider = LAZY_INSTANCE_INITIALIZER;
+
+void SetLocalizedStringProvider(const LocalizedStringProvider& callback) {
+  DCHECK(g_localized_string_provider == nullptr);

[ajm, 2015/09/18 00:43:21]

Not sure if this is a common pattern with LazyInstance, but it has an overloaded
operator== that supports it.

+  g_localized_string_provider.Get() = callback;
+}
+
+std::string GetLocalizedStringUTF8(MessageId message_id) {
+  return base::UTF16ToUTF8(GetLocalizedStringUTF16(message_id));
+}
+
+base::string16 GetLocalizedStringUTF16(MessageId message_id) {
+  return g_localized_string_provider == nullptr
+             ? base::string16()
+             : g_localized_string_provider.Get().Run(message_id);
+}
+
+}  // namespace media