Expose method to reset translate settings.

ios/web_view/public/cwv_translation_controller.h

Index: ios/web_view/public/cwv_translation_controller.h
diff --git a/ios/web_view/public/cwv_translation_controller.h b/ios/web_view/public/cwv_translation_controller.h
index ee3106649081725778d7c3999c2ca9b73fe042d1..d5a7988bed873957af35e585293d1ef420fb9515 100644
--- a/ios/web_view/public/cwv_translation_controller.h
+++ b/ios/web_view/public/cwv_translation_controller.h
@@ -52,6 +52,10 @@ CWV_EXPORT
 @property(nonatomic, readonly)
     NSSet<CWVTranslationLanguage*>* supportedLanguages;
 
+// Resets all translation policies to CWVTranslationPolicyAsk.
+// Only resets non-incognito settings.
++ (void)resetTranslationPolicies;
+
 // Begins translation on the current page from |sourceLanguage| to
 // |targetLanguage|. These language parameters must be chosen from
 // |supportedLanguages|. Set |userInitiated| to YES if translation
@@ -70,6 +74,7 @@ CWV_EXPORT
 
 // Sets or retrieves translation policies associated with a specified language.
 // |pageLanguage| should be the language code of the language.
+// Early returns in incognito mode.

[Hiroshi Ichikawa, 2017/07/10 05:58:39]

Optional: Maybe better to make it an assertion failure instead of silently
ignoring the call? The client shouldn't call this method on incognito mode,
right?

[jzw1, 2017/07/10 06:04:05]

Done.

 - (void)setTranslationPolicy:(CWVTranslationPolicy*)policy
              forPageLanguage:(CWVTranslationLanguage*)pageLanguage;
 - (CWVTranslationPolicy*)translationPolicyForPageLanguage:
@@ -77,6 +82,7 @@ CWV_EXPORT
 
 // Sets or retrieves translation policies associated with a specified page.
 // |pageHost| should be the hostname of the website. Must not be empty.
+// Early returns in incognito mode.

[Hiroshi Ichikawa, 2017/07/10 05:58:39]

Ditto.

[jzw1, 2017/07/10 06:04:05]

Done.

 - (void)setTranslationPolicy:(CWVTranslationPolicy*)policy
                  forPageHost:(NSString*)pageHost;
 - (CWVTranslationPolicy*)translationPolicyForPageHost:(NSString*)pageHost;