[ios] Adds configuration helper files for voice search.

ios/chrome/browser/voice/speech_input_locale.h

+// Copyright 2016 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 IOS_CHROME_BROWSER_VOICE_SPEECH_INPUT_LOCALE_H_
+#define IOS_CHROME_BROWSER_VOICE_SPEECH_INPUT_LOCALE_H_
+
+#include <string>
+
+#include "base/strings/string16.h"
+
+namespace voice {
+
+// Struct describing a valid speech input locale.
+typedef struct {
+  // The locale code in canonical form (e.g. "en-US", "fr-FR").
+  std::string code;
+  // The display name (e.g. "English U.S.", "Français (France)").
+  base::string16 display_name;
+} SpeechInputLocale;
+
+}  // namespace voice
+
+#endif  // IOS_CHROME_BROWSER_VOICE_SPEECH_INPUT_LOCALE_H_