Push API: Return cached registration if available.

content/public/common/push_messaging_status.h

 // Copyright 2014 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 CONTENT_PUBLIC_COMMON_PUSH_MESSAGING_STATUS_H_
 #define CONTENT_PUBLIC_COMMON_PUSH_MESSAGING_STATUS_H_
 
 namespace content {
 
 // Push registration success / error codes for internal use & reporting in UMA.
 enum PushRegistrationStatus {
   // Registration was successful.
   PUSH_REGISTRATION_STATUS_SUCCESS = 0,
 
+  // A successful registration was already cached in Service Worker storage.
+  PUSH_REGISTRATION_STATUS_SUCCESS_FROM_CACHE = 1,
+
   // Registration failed because there is no Service Worker.
-  PUSH_REGISTRATION_STATUS_NO_SERVICE_WORKER = 1,
+  PUSH_REGISTRATION_STATUS_NO_SERVICE_WORKER = 2,
 
   // Registration failed because the push service is not available.
-  PUSH_REGISTRATION_STATUS_SERVICE_NOT_AVAILABLE = 2,
+  PUSH_REGISTRATION_STATUS_SERVICE_NOT_AVAILABLE = 3,
 
   // Registration failed because the maximum number of registratons has been
   // reached.
-  PUSH_REGISTRATION_STATUS_LIMIT_REACHED = 3,
+  PUSH_REGISTRATION_STATUS_LIMIT_REACHED = 4,
 
   // Registration failed because permission was denied.
-  PUSH_REGISTRATION_STATUS_PERMISSION_DENIED = 4,
+  PUSH_REGISTRATION_STATUS_PERMISSION_DENIED = 5,
 
   // Registration failed in the push service implemented by the embedder.
-  PUSH_REGISTRATION_STATUS_SERVICE_ERROR = 5,
+  PUSH_REGISTRATION_STATUS_SERVICE_ERROR = 6,
 
   // Registration failed because no sender id was provided by the page.
-  PUSH_REGISTRATION_STATUS_NO_SENDER_ID = 6,
+  PUSH_REGISTRATION_STATUS_NO_SENDER_ID = 7,
 
   // Registration succeeded, but we failed to persist it.
-  PUSH_REGISTRATION_STATUS_STORAGE_ERROR = 7,
+  PUSH_REGISTRATION_STATUS_STORAGE_ERROR = 8,
 
   // NOTE: Do not renumber these as that would confuse interpretation of
   // previously logged data. When making changes, also update the enum list
   // in tools/metrics/histograms/histograms.xml to keep it in sync, and
   // update PUSH_REGISTRATION_STATUS_LAST below.
 
   // Used for IPC message range checks.
   PUSH_REGISTRATION_STATUS_LAST = PUSH_REGISTRATION_STATUS_STORAGE_ERROR
 };
 
@@ skipping 16 matching lines @@
 
   // Used for IPC message range checks.
   PUSH_DELIVERY_STATUS_LAST = PUSH_DELIVERY_STATUS_EVENT_WAITUNTIL_REJECTED
 };
 
 const char* PushRegistrationStatusToString(PushRegistrationStatus status);
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_PUSH_MESSAGING_STATUS_H_