Add extra information for ReadingList ContentSuggestion

components/ntp_snippets/reading_list/reading_list_distillation_state_util.h

Index: components/ntp_snippets/reading_list/reading_list_distillation_state_util.h
diff --git a/components/ntp_snippets/reading_list/reading_list_distillation_state_util.h b/components/ntp_snippets/reading_list/reading_list_distillation_state_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..a00553fc98ab2af28e92b6ce28643d0937ccf1df
--- /dev/null
+++ b/components/ntp_snippets/reading_list/reading_list_distillation_state_util.h
@@ -0,0 +1,23 @@
+// 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_NTP_SNIPPETS_READING_LIST_READING_LIST_DISTILLATION_STATE_UTIL_H_
+#define COMPONENTS_NTP_SNIPPETS_READING_LIST_READING_LIST_DISTILLATION_STATE_UTIL_H_
+
+#include "components/ntp_snippets/content_suggestion.h"
+#include "components/reading_list/core/reading_list_entry.h"
+
+namespace ntp_snippets {
+
+ReadingListEntry::DistillationState ReadingListStateFromSuggestionState(
+    ReadingListSuggestionExtra::ReadingListSuggestionDistilledState
+        distilled_state);
+
+ReadingListSuggestionExtra::ReadingListSuggestionDistilledState
+SuggestionStateFromReadingListState(
+    ReadingListEntry::DistillationState distilled_state);
+
+}  // namespace ntp_snippets
+
+#endif  // COMPONENTS_NTP_SNIPPETS_READING_LIST_READING_LIST_DISTILLATION_STATE_UTIL_H_