ServiceWorker: Add UMA for storage recovery operation

content/browser/service_worker/service_worker_database.cc

 // 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.
 
 #include "content/browser/service_worker/service_worker_database.h"
 
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 951 matching lines @@
   leveldb::Options options;
   if (path_.empty()) {
     if (env_) {
       options.env = env_.get();
     } else {
       // In-memory database not initialized.
       return STATUS_OK;
     }
   }
 
-  return LevelDBStatusToStatus(
-      leveldb::DestroyDB(path_.AsUTF8Unsafe(), options));
+  Status status =
+      LevelDBStatusToStatus(leveldb::DestroyDB(path_.AsUTF8Unsafe(), options));
+  ServiceWorkerMetrics::RecordDestroyDatabaseResult(status);
+  return status;
 }
 
 ServiceWorkerDatabase::Status ServiceWorkerDatabase::LazyOpen(
     bool create_if_missing) {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 
   // Do not try to open a database if we tried and failed once.
   if (state_ == DISABLED)
     return STATUS_ERROR_FAILED;
   if (IsOpen())
@@ skipping 459 matching lines @@
 
 void ServiceWorkerDatabase::HandleWriteResult(
     const tracked_objects::Location& from_here,
     Status status) {
   if (status != STATUS_OK)
     Disable(from_here, status);
   ServiceWorkerMetrics::CountWriteDatabaseResult(status);
 }
 
 }  // namespace content