Connect BackgroundFetch to the OfflineItemCollection

content/browser/background_fetch/background_fetch_registration_id.h

Index: content/browser/background_fetch/background_fetch_registration_id.h
diff --git a/content/browser/background_fetch/background_fetch_registration_id.h b/content/browser/background_fetch/background_fetch_registration_id.h
index 32fb5da8145ae94420d4c4c0c74085ddeeb09f5c..600ba885df23597fd9d5ca3997bd34efdaf5dab8 100644
--- a/content/browser/background_fetch/background_fetch_registration_id.h
+++ b/content/browser/background_fetch/background_fetch_registration_id.h
@@ -25,6 +25,14 @@ class CONTENT_EXPORT BackgroundFetchRegistrationId {
   BackgroundFetchRegistrationId(BackgroundFetchRegistrationId&& other);
   ~BackgroundFetchRegistrationId();
 
+  // Deserialize the string format of a registration_id.
+  static bool Deserialize(const std::string& serialized_registration_id,
+                          BackgroundFetchRegistrationId* out_registration_id);
+
+  // Serialize the registration_id into a string so that it can be sent to
+  // embedders in a neutral format.
+  std::string Serialize() const;
+
   BackgroundFetchRegistrationId& operator=(
       const BackgroundFetchRegistrationId& other);