[ios] Adds configuration helper files for voice search.

ios/public/provider/chrome/browser/voice/voice_search_language.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_PUBLIC_PROVIDER_CHROME_BROWSER_VOICE_VOICE_SEARCH_LANGUAGE_H_
+#define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_VOICE_VOICE_SEARCH_LANGUAGE_H_
+
+#import <Foundation/Foundation.h>
+
+// VoiceSearchLanguage stores data about a single supported voice search
+// language.
+@interface VoiceSearchLanguage : NSObject
+
+// Creates a VoiceSearchLanguageObject.  |localizationPreferences| can be nil.
+- (instancetype)initWithIdentifier:(NSString*)identifier
+                       displayName:(NSString*)displayName
+            localizationPreference:(NSString*)localizationPreference
+    NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+// The BCP 47 identifier for the language, e.g. "en-us" or "yue-hant-hk".
+@property(nonatomic, readonly, copy) NSString* identifier;
+
+// The display name for the language.
+@property(nonatomic, readonly, copy) NSString* displayName;
+
+// A localization identifier for use with +[NSBundle
+// preferredLocalizationsFromArray:forPreferences:].  In general this is the
+// same as |identifier|, but in some cases e.g.  Chinese and Cantonese it
+// differs to facilitate the NSBundle method.
+@property(nonatomic, readonly, copy) NSString* localizationPreference;
+
+@end
+
+#endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_VOICE_VOICE_SEARCH_LANGUAGE_H_