Allow fetching personalized snippets from ChromeReader.

components/ntp_snippets/ntp_snippets_constants.h

Index: components/ntp_snippets/ntp_snippets_constants.h
diff --git a/components/ntp_snippets/ntp_snippets_constants.h b/components/ntp_snippets/ntp_snippets_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..c12ce9360abea628178cf9bb442b5122480c6d49
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+++ b/components/ntp_snippets/ntp_snippets_constants.h
@@ -0,0 +1,15 @@
+// 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.
+
+#ifndef COMPONENTS_NTP_SNIPPETS_CONSTANTS_H_
+#define COMPONENTS_NTP_SNIPPETS_CONSTANTS_H_
+
+namespace ntp_snippets {
+
+// Name of the variation parameters study to configure NTP snippets.
+extern const char kStudyName[];
+
+}  // namespace ntp_snippets
+
+#endif