Implemented new Translate API for purely Objective-C clients.

ios/web_view/internal/translate/cwv_translation_language.mm

+// Copyright 2017 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.
+
+#import "ios/web_view/internal/translate/cwv_translation_language_internal.h"
+
+#include "base/strings/string16.h"
+#include "base/strings/sys_string_conversions.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation CWVTranslationLanguage
+
+@synthesize languageCode = _languageCode;
+@synthesize languageName = _languageName;
+
+- (instancetype)initWithLanguageCode:(const std::string&)languageCode
+                        languageName:(const base::string16&)languageName {
+  self = [super init];
+  if (self) {
+    _languageCode = base::SysUTF8ToNSString(languageCode);
+    _languageName = base::SysUTF16ToNSString(languageName);
+  }
+  return self;
+}
+
+@end