Add additional histograms with suffixes to ImportantFileWriter.

components/bookmarks/browser/bookmark_storage.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 "components/bookmarks/browser/bookmark_storage.h"
 
 #include <stddef.h>
 #include <algorithm>
 #include <utility>
 
@@ skipping 135 matching lines @@
 
 // BookmarkStorage -------------------------------------------------------------
 
 BookmarkStorage::BookmarkStorage(
     BookmarkModel* model,
     const base::FilePath& profile_path,
     base::SequencedTaskRunner* sequenced_task_runner)
     : model_(model),
       writer_(profile_path.Append(kBookmarksFileName),
               sequenced_task_runner,
-              base::TimeDelta::FromMilliseconds(kSaveDelayMS)),
+              base::TimeDelta::FromMilliseconds(kSaveDelayMS),
+              "BookmarkStorage"),
       sequenced_task_runner_(sequenced_task_runner),
-      weak_factory_(this) {
-}
+      weak_factory_(this) {}
 
 BookmarkStorage::~BookmarkStorage() {
   if (writer_.HasPendingWrite())
     writer_.DoScheduledWrite();
 }
 
 void BookmarkStorage::LoadBookmarks(
     std::unique_ptr<BookmarkLoadDetails> details,
     const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
   sequenced_task_runner_->PostTask(
@@ skipping 59 matching lines @@
   }
 
   std::unique_ptr<std::string> data(new std::string);
   if (!SerializeData(data.get()))
     return false;
   writer_.WriteNow(std::move(data));
   return true;
 }
 
 }  // namespace bookmarks