Issue 501916 : Add data type counts to profile deletion flow

components/history/core/browser/history_service.h

Index: components/history/core/browser/history_service.h
diff --git a/components/history/core/browser/history_service.h b/components/history/core/browser/history_service.h
index fb12f816012d3865b1ae54cb3846bf1293ee0933..c1df3e4f6b851418a01ff4c8c9a2821eba36c0f1 100644
--- a/components/history/core/browser/history_service.h
+++ b/components/history/core/browser/history_service.h
@@ -331,6 +331,17 @@ class HistoryService : public syncer::SyncableService, public KeyedService {
       const QueryFilteredURLsCallback& callback,
       base::CancelableTaskTracker* tracker);
 
+  // Statistics ----------------------------------------------------------------
+
+  // Returns the count of URLs in the url database. The argument is the count.
+  // The count is zero if query to the database failed.
+  typedef base::Callback<void(int)> CountURLsCallback;
+
+  // Returns the count of URLs in the url database.
+  base::CancelableTaskTracker::TaskId CountURLs(
+      const CountURLsCallback& callback,
+      base::CancelableTaskTracker* tracker);
+
   // Database management operations --------------------------------------------
 
   // Delete all the information related to a single url.