Add a timeout to push message processing.

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.
@@ skipping 168 matching lines @@
   // The message could not be delivered because no service worker was found.
   PUSH_DELIVERY_STATUS_NO_SERVICE_WORKER = 4,
 
   // The message could not be delivered because of a service worker error.
   PUSH_DELIVERY_STATUS_SERVICE_WORKER_ERROR = 5,
 
   // The message was delivered, but the Service Worker passed a Promise to
   // event.waitUntil that got rejected.
   PUSH_DELIVERY_STATUS_EVENT_WAITUNTIL_REJECTED = 6,
 
+  // The message was delivered, but the Service Worker timed out processing it.
+  PUSH_DELIVERY_STATUS_TIMEOUT = 7,

[Peter Beverloo, 2016/11/28 10:33:54]

you need to update histograms.xml

[harkness, 2016/11/28 15:33:01]

Thanks! I forgot that.

+
   // 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_DELIVERY_STATUS_LAST below.
 
-  PUSH_DELIVERY_STATUS_LAST = PUSH_DELIVERY_STATUS_EVENT_WAITUNTIL_REJECTED
+  PUSH_DELIVERY_STATUS_LAST = PUSH_DELIVERY_STATUS_TIMEOUT
 };
 
 // Push message user visible tracking for reporting in UMA. Enum values can be
 // added, but must never be renumbered or deleted and reused.
 enum PushUserVisibleStatus {
   // A notification was required and one (or more) were shown.
   PUSH_USER_VISIBLE_STATUS_REQUIRED_AND_SHOWN = 0,
 
   // A notification was not required, but one (or more) were shown anyway.
   PUSH_USER_VISIBLE_STATUS_NOT_REQUIRED_BUT_SHOWN = 1,
@@ skipping 18 matching lines @@
       PUSH_USER_VISIBLE_STATUS_REQUIRED_BUT_NOT_SHOWN_GRACE_EXCEEDED
 };
 
 const char* PushRegistrationStatusToString(PushRegistrationStatus status);
 
 const char* PushUnregistrationStatusToString(PushUnregistrationStatus status);
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_PUSH_MESSAGING_STATUS_H_