Make profile statistics tasks inspectable by tests

chrome/browser/profiles/profile_statistics_common.cc

Index: chrome/browser/profiles/profile_statistics_common.cc
diff --git a/chrome/browser/profiles/profile_statistics_common.cc b/chrome/browser/profiles/profile_statistics_common.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ffa09b65e3ef212fb7bedd8d02377d84e268f43a
--- /dev/null
+++ b/chrome/browser/profiles/profile_statistics_common.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_common.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