Add ContextualSuggestionsService to Omnibox

components/contextual_suggestions/features.h

Index: components/contextual_suggestions/features.h
diff --git a/components/contextual_suggestions/features.h b/components/contextual_suggestions/features.h
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+++ b/components/contextual_suggestions/features.h
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+// 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_CONTEXTUAL_SUGGESTIONS_FEATURES_H_
+#define COMPONENTS_CONTEXTUAL_SUGGESTIONS_FEATURES_H_
+
+#include "base/feature_list.h"
+
+namespace features {
+
+// Feature used for using an experimental zero suggest suggestions service
+// for omnibox. This feature redirects requests to a service maintained by
+// the Chrome team.
+extern const base::Feature kZeroSuggestRedirectToChrome;
+
+}  // namespace features
+
+#endif  // COMPONENTS_CONTEXTUAL_SUGGESTIONS_FEATURES_H_