Support persistent incognito preferences

chrome/common/extensions/api/extension_api.json

Index: chrome/common/extensions/api/extension_api.json
diff --git a/chrome/common/extensions/api/extension_api.json b/chrome/common/extensions/api/extension_api.json
index 456b9b8aceafb86ad29d452d364cb2674e016a33..82645ba73744781aadc630cc22c05c84ea1ca79f 100644
--- a/chrome/common/extensions/api/extension_api.json
+++ b/chrome/common/extensions/api/extension_api.json
@@ -5384,9 +5384,9 @@
                   },
                   "scope": {
                     "type": "string",
-                    "enum": ["regular"],
+                    "enum": ["regular", "incognito_persistent"],
                     "optional": true,
-                    "description": "Where to set the preference (default: regular). 'regular' = preference for regular profile (which is inherited by the incognito profile if not overridden elsewhere)."
+                    "description": "Where to set the preference (default: regular). 'regular' = preference for regular profile (which is inherited by the incognito profile if not overridden elsewhere), 'incognito_persistent' = preference for incognito profile that sustains browser restarts (overrides regular preferences)."
                   }
                 }
               },
@@ -5411,9 +5411,9 @@
                 "properties": {
                   "scope": {
                     "type": "string",
-                    "enum": ["regular"],
+                    "enum": ["regular", "incognito_persistent"],
                     "optional": true,
-                    "description": "Where to clear the preference (default: regular). 'regular' = preference for regular profile (which is inherited by the incognito profile if not overridden elsewhere)."
+                    "description": "Where to set the preference (default: regular). 'regular' = preference for regular profile (which is inherited by the incognito profile if not overridden elsewhere), 'incognito_persistent' = preference for incognito profile that sustains browser restarts (overrides regular preferences)."
                   }
                 }
               },