Issue 501916 : Add data type counts to profile deletion flow

components/history/core/browser/history_backend.cc

 // Copyright (c) 2012 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/history/core/browser/history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <list>
 #include <map>
@@ skipping 1036 matching lines @@
   result->success = db_ && db_->GetRowForURL(url, &result->row);
   // Optionally query the visits.
   if (result->success && want_visits)
     db_->GetVisitsForURL(result->row.id(), &result->visits);
 }
 
 TypedUrlSyncableService* HistoryBackend::GetTypedUrlSyncableService() const {
   return typed_url_syncable_service_.get();
 }
 
+// Statistics ------------------------------------------------------------------
+
+int HistoryBackend::CountURLs() {
+  if (!db_)

[lwchkg, 2015/08/11 15:54:51]

Also suggest to rename to GetHistoryCount.

Mike: note the "return 0" here. We have discussed about this before.

[Mike Lerman, 2015/08/13 14:56:33]

GetHistoryCount or GetCountHistoryEntries sound good.

+    return 0;
+  else
+    return db_->GetCountOfURLsWithVisibleVisit();
+}
+
 // Keyword visits --------------------------------------------------------------
 
 void HistoryBackend::SetKeywordSearchTermsForURL(const GURL& url,
                                                  KeywordID keyword_id,
                                                  const base::string16& term) {
   if (!db_)
     return;
 
   // Get the ID for this URL.
   URLRow row;
@@ skipping 1640 matching lines @@
   // transaction is currently open.
   db_->CommitTransaction();
   db_->Vacuum();
   db_->BeginTransaction();
   db_->GetStartDate(&first_recorded_time_);
 
   return true;
 }
 
 }  // namespace history