Add localized default audio device names.

media/base/media_resources.h

+// 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.
+
+#ifndef MEDIA_BASE_MEDIA_RESOURCES_H_
+#define MEDIA_BASE_MEDIA_RESOURCES_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/strings/string16.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+// The media layer can't access Chrome's resource bundle directly. This facility
+// allows clients to provide indirect access.
+
+// IDs that will get mapped to corresponding entries with IDS_ prefixes in
+// chrome/app/generated_resources.grd.
+enum MessageId {
+  DEFAULT_AUDIO_DEVICE_NAME,
+#if defined(OS_WIN)
+  COMMUNICATIONS_AUDIO_DEVICE_NAME,
+#endif
+#if defined(OS_CHROMEOS)
+  BEAMFORMING_ON_DEFAULT_AUDIO_INPUT_DEVICE_NAME,
+  BEAMFORMING_OFF_DEFAULT_AUDIO_INPUT_DEVICE_NAME,
+#endif
+};
+
+// Implementations are expected to convert MessageIds to generated_resources.grd
+// IDs and extract the matching string from Chrome's resource bundle (e.g.
+// through l10n_util::GetStringUTF16).
+using LocalizedStringProvider =
+    base::Callback<base::string16(MessageId message_id)>;
+
+// Initializes the global LocalizedStringProvider callback. Must only be called
+// once.
+MEDIA_EXPORT void SetLocalizedStringProvider(
+    const LocalizedStringProvider& callback);
+
+// Returns a resource string corresponding to |message_id|. See l10n_util.h.
+// Returns an empty string if the LocalizedStringProvider has not been
+// initialized or if the ID is unrecognized.
+std::string GetLocalizedStringUTF8(MessageId message_id);
+base::string16 GetLocalizedStringUTF16(MessageId message_id);
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_MEDIA_RESOURCES_H_