Add a feature to display a persistence toggle for permission prompts on Android.

chrome/browser/permissions/permission_infobar_delegate.h

Index: chrome/browser/permissions/permission_infobar_delegate.h
diff --git a/chrome/browser/permissions/permission_infobar_delegate.h b/chrome/browser/permissions/permission_infobar_delegate.h
index a605229d6f487d4658f1584b1ebe1b051b3b7fbc..0e09bab078e503c4409041faf1e98af619acd6ec 100644
--- a/chrome/browser/permissions/permission_infobar_delegate.h
+++ b/chrome/browser/permissions/permission_infobar_delegate.h
@@ -25,6 +25,14 @@ class PermissionInfobarDelegate : public ConfirmInfoBarDelegate {
   using PermissionSetCallback = base::Callback<void(bool, bool)>;
   ContentSettingsType content_setting() const { return content_settings_type_; }
 
+  // Returns true if the infobar should display a toggle to allow users to
+  // opt-out of persisting their accept/deny decision.
+  bool ShouldShowPersistenceToggle() const;
+
+  // Sets whether or not a decided permission should be persisted to content
+  // settings.
+  void SetPersist(bool persist) { persist_ = persist; }
+
  protected:
   PermissionInfobarDelegate(const GURL& requesting_origin,
                             content::PermissionType permission_type,
@@ -49,12 +57,13 @@ class PermissionInfobarDelegate : public ConfirmInfoBarDelegate {
   void SetPermission(bool update_content_setting, bool allowed);
 
   GURL requesting_origin_;
-  bool action_taken_;
   content::PermissionType permission_type_;
   ContentSettingsType content_settings_type_;
-  bool user_gesture_;
   Profile* const profile_;
   const PermissionSetCallback callback_;
+  bool action_taken_;
+  bool user_gesture_;
+  bool persist_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionInfobarDelegate);
 };