Implemented new Translate API for purely Objective-C clients.

ios/web_view/public/cwv_language_detection_result.h

Index: ios/web_view/public/cwv_language_detection_result.h
diff --git a/ios/web_view/public/cwv_language_detection_result.h b/ios/web_view/public/cwv_language_detection_result.h
new file mode 100644
index 0000000000000000000000000000000000000000..29923e3ead38a41054dc2eaa17fbf940cbc151f1
--- /dev/null
+++ b/ios/web_view/public/cwv_language_detection_result.h
@@ -0,0 +1,37 @@
+// 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_LANGUAGE_DETECTION_RESULT_H
+#define IOS_WEB_VIEW_PUBLIC_CWV_LANGUAGE_DETECTION_RESULT_H
+
+#import <ChromeWebView/cwv_export.h>
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class CWVTranslationLanguage;
+
+// Encapsulates the results of language detection in one class.
+CWV_EXPORT
+@interface CWVLanguageDetectionResult : NSObject
+
+- (instancetype)init NS_UNAVAILABLE;
+
+// The detected language of the page.
+// Can be used to translate to |suggestedTargetLanguage|.

[michaeldo, 2017/05/01 18:25:37]

No need for second line of comment.

[jzw1, 2017/05/08 03:36:28]

Done.

+@property(nonatomic, readonly) CWVTranslationLanguage* pageLanguage;
+
+// The suggested language to translate to.

[michaeldo, 2017/05/01 18:25:37]

What about this specifying where this comes from. For example:

The suggested target translation language based on the user's device language.

Please feel free to be more specific though, I didn't check where this value is
filled in from.

[jzw1, 2017/05/08 03:36:28]

I believe Eugene didn't want to be too specific since this can change according
to preferences.

[michaeldo, 2017/05/08 15:15:48]

Ok, no prob. That's a good point.

+// Can be used to translate from |detectedPageLanguage|.

[michaeldo, 2017/05/01 18:25:37]

No need for second line of comment.

[jzw1, 2017/05/08 03:36:28]

Done.

+@property(nonatomic, readonly) CWVTranslationLanguage* suggestedTargetLanguage;
+
+// The list of supported languages that can be used in translation.
+@property(nonatomic, readonly)

[michaeldo, 2017/05/01 18:25:37]

copy attribute here?

[jzw1, 2017/05/08 03:36:28]

Done.

+    NSArray<CWVTranslationLanguage*>* supportedLanguages;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif  // IOS_WEB_VIEW_PUBLIC_CWV_LANGUAGE_DETECTION_RESULT_H