[Offline pages] Reporting completed attempt when Chrome is killed

components/offline_pages/core/background/offliner.h

 // Copyright 2016 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 COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_OFFLINER_H_
 #define COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_OFFLINER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 39 matching lines @@
     // The RequestCoordinator tried to start loading the request but the
     // loading request was not accepted.
     LOADING_NOT_ACCEPTED = 12,
     // The RequestCoordinator did not start loading the request because
     // updating the status in the request queue failed.
     QUEUE_UPDATE_FAILED = 13,
     // Scheduler canceled processing of requests.
     BACKGROUND_SCHEDULER_CANCELED = 14,
     // We saved a snapshot on the last retry, after timeout.
     SAVED_ON_LAST_RETRY = 15,
+    // Indicates that attempt failed due to browser being killed.
+    // There are 3 ways that might happen:
+    // * System was running out of memory, while browser was running in the
+    //   background.
+    // * User swiped away the browser as it was offlining content.
+    // * Offliner crashed.
+    // We detect the situation in ReconcileTask after starting
+    // RequestCoordinator.
+    BROWSER_KILLED = 16,
     // NOTE: insert new values above this line and update histogram enum too.
     STATUS_COUNT
   };
 
   // Reports the load progress of a request.
   typedef base::Callback<void(const SavePageRequest&, int64_t received_bytes)>
       ProgressCallback;
   // Reports the completion status of a request.
   typedef base::Callback<void(const SavePageRequest&, RequestStatus)>
       CompletionCallback;
@@ skipping 22 matching lines @@
   // snapshot of the current webcontents. If that is the case, the result of
   // offlining will be provided by |completion_callback|.
   virtual bool HandleTimeout(int64_t request_id) = 0;
 
   // TODO(dougarnett): add policy support methods.
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_OFFLINER_H_