Implemented new Translate API for purely Objective-C clients.

ios/web_view/public/cwv_translation_language.h

Index: ios/web_view/public/cwv_translation_language.h
diff --git a/ios/web_view/public/cwv_translation_language.h b/ios/web_view/public/cwv_translation_language.h
new file mode 100644
index 0000000000000000000000000000000000000000..e60281584616a78487f3c51aa2d98aece92d1db8
--- /dev/null
+++ b/ios/web_view/public/cwv_translation_language.h
@@ -0,0 +1,25 @@
+// 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.
+
+#ifndef IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATION_LANGUAGE_H
+#define IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATION_LANGUAGE_H
+
+#import <ChromeWebView/cwv_export.h>
+#import <Foundation/Foundation.h>
+
+// Represents a single translatable language.
+CWV_EXPORT
+@interface CWVTranslationLanguage : NSObject
+
+- (instancetype)init NS_UNAVAILABLE;
+
+// The ISO language code. en for English, es for Spanish, etc...

[Hiroshi Ichikawa, 2017/04/26 08:40:57]

Can you add a link to https://cloud.google.com/translate/docs/languages to
clarify the spec? I believe this is the one used here...

[jzw1, 2017/04/27 04:54:02]

Done.

+@property(nonatomic, copy, readonly) NSString* languageCode;
+
+// The language name in the current OS locale.

[Eugene But (OOO till 7-30), 2017/04/26 20:15:31]

How about "Localized language name"?

[jzw1, 2017/04/27 04:54:02]

Done.

[Eugene But (OOO till 7-30), 2017/04/27 13:08:08]

I think "The language name in the current OS locale." means a different thing
that "Localized language name". Locale is not a language. I suggested "Localized
language name" to follow NSLocalizedString naming pattern.

[jzw1, 2017/04/28 02:34:53]

I think what you are saying is you prefer localizedLanguageName over
localizedName, yes?

[Hiroshi Ichikawa, 2017/04/28 02:49:51]

I believe Eugene is talking about the comment, not the property name. His
suggestion is to write "Localized language name" instead of "The language name
in the current OS locale.".

[Eugene But (OOO till 7-30), 2017/04/28 03:07:28]

No. My comment is related to "The language name in the current OS locale.". Old
and new method names look good to me.

[jzw1, 2017/04/28 05:43:35]

ahh ok sorry for understanding. ill update the comment and use the old name.

+@property(nonatomic, copy, readonly) NSString* languageName;
+
+@end
+
+#endif  // IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATION_LANGUAGE_H