Expose way to enable/disable translate.

ios/web_view/public/cwv_translation_controller.h

 // 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_CONTROLLER_H
 #define IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATION_CONTROLLER_H
 
 #import <Foundation/Foundation.h>
 
 #import "cwv_export.h"
@@ skipping 38 matching lines @@
     delegate;
 
 // The set of supported languages for translation.
 @property(nonatomic, readonly)
     NSSet<CWVTranslationLanguage*>* supportedLanguages;
 
 // Resets all translation policies to default (CWVTranslationPolicyAsk).
 // Only resets non-incognito settings.
 + (void)resetTranslationPolicies;
 
+// Enables or disables the translate feature. Only applies to non-incognito.

[Eugene But (OOO till 7-30), 2017/07/13 17:52:58]

Why does it work only for non-incognito? If I disable translation in app prefs,
as a user I would not want to see it in Incognito.

[jzw1, 2017/07/13 21:05:05]

Refactored so that the user can configure for both incognito and non-incognito.
This isn't perfect because incognito settings are only stored temporary in
memory and do not inherit any settings from non-incognito like Chrome does. If
we wanted to go that route, we would need to refactor our browser states some
more...

++ (BOOL)isTranslateEnabled;

[Hiroshi Ichikawa, 2017/07/13 07:28:59]

Optional: Maybe it can be just "isEnabled" because it's obvious that it's for
translate from the class it belongs to. Also, how about defining a @property for
this?

[Eugene But (OOO till 7-30), 2017/07/13 17:52:58]

Or isTranslationEnabled/setTranslationEnabled: to be consistent with
resetTranslationPolicies?

[jzw1, 2017/07/13 21:05:05]

I've renamed these in the new class CWVTranslationConfiguration.

++ (void)setTranslateEnabled:(BOOL)enabled;
+
 // Begins translation on the current page from |sourceLanguage| to
 // |targetLanguage|. These language parameters must be chosen from
 // |supportedLanguages|. Set |userInitiated| to YES if translation
 // is a result of explicit user action. |userInitiated| will be
 // passed along to the CWVTranslationControllerDelegate methods.
 // Results in a No-op if there is no current page.
 - (void)translatePageFromLanguage:(CWVTranslationLanguage*)sourceLanguage
                        toLanguage:(CWVTranslationLanguage*)targetLanguage
                     userInitiated:(BOOL)userInitiated;
 
@@ skipping 16 matching lines @@
 // Not supported in incognito mode.
 - (void)setTranslationPolicy:(CWVTranslationPolicy*)policy
                  forPageHost:(NSString*)pageHost;
 - (CWVTranslationPolicy*)translationPolicyForPageHost:(NSString*)pageHost;
 
 @end
 
 NS_ASSUME_NONNULL_END
 
 #endif  // IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATION_CONTROLLER_H