Record offline histograms with suffix via Histogram::FactoryGet

components/offline_pages/client_namespace_constants.cc

Index: components/offline_pages/client_namespace_constants.cc
diff --git a/components/offline_pages/client_namespace_constants.cc b/components/offline_pages/client_namespace_constants.cc
new file mode 100644
index 0000000000000000000000000000000000000000..508db279a458988a0913974e85d0c453dbf90ab5
--- /dev/null
+++ b/components/offline_pages/client_namespace_constants.cc
@@ -0,0 +1,14 @@
+// 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 "components/offline_pages/client_namespace_constants.h"
+
+namespace offline_pages {
+
+const char kBookmarkNamespace[] = "bookmark";
+const char kLastNNamespace[] = "last_n";
+
+const char kDefaultNamespace[] = "default";
+
+}  // namespace offline_pages