Make profile statistics tasks inspectable by tests

chrome/browser/profiles/profile_statistics_constants.cc

Index: chrome/browser/profiles/profile_statistics_constants.cc
diff --git a/chrome/browser/profiles/profile_statistics_constants.cc b/chrome/browser/profiles/profile_statistics_constants.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a17c381bc88866cec531377fa9eafffe8d9600a7
--- /dev/null
+++ b/chrome/browser/profiles/profile_statistics_constants.cc
@@ -0,0 +1,13 @@
+// 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.
+
+#include "chrome/browser/profiles/profile_statistics_constants.h"
+
+namespace profiles {
+// Constants for the categories in ProfileCategoryStats
+const char kProfileStatisticsBrowsingHistory[] = "BrowsingHistory";
+const char kProfileStatisticsPasswords[] = "Passwords";
+const char kProfileStatisticsBookmarks[] = "Bookmarks";
+const char kProfileStatisticsSettings[] = "Settings";
+}  // namespace profiles