Add flag for disabling minimum of ntp tile suggestions

components/suggestions/features.h

+// Copyright 2017 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_SUGGESTIONS_FEATURES_H_
+#define COMPONENTS_SUGGESTIONS_FEATURES_H_
+
+#include "base/feature_list.h"
+
+namespace suggestions {
+
+// If this feature is enabled, we request and use suggestions even if there are
+// only very few of them.
+extern const base::Feature kUseSuggestionsEvenIfFewFeature;
+
+}  // namespace suggestions
+
+#endif  // COMPONENTS_SUGGESTIONS_FEATURES_H_