Split OfflinePageSuggestions into two categories

components/ntp_snippets/category.h

 // 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_CATEGORY_H_
 #define COMPONENTS_NTP_SNIPPETS_CATEGORY_H_
 
 #include <ostream>
 
 namespace ntp_snippets {
 
 class CategoryFactory;
 
 // These are the categories that the client knows about.
 // The values before LOCAL_CATEGORIES_COUNT are the categories that are provided
 // locally on the device. Categories provided by the server (IDs strictly larger
 // than REMOTE_CATEGORIES_OFFSET) only need to be hard-coded here if they need
 // to be recognized by the client implementation.
 // On Android builds, a Java counterpart will be generated for this enum.
 // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.chrome.browser.ntp.snippets
 enum class KnownCategories {
-  // Pages downloaded for offline consumption.
-  OFFLINE_PAGES,
+  // Pages recently downloaded during normal navigation.
+  RECENT_TABS,
+
+  // Pages downloaded by the user for offline consumption.
+  DOWNLOADS,
 
   // Recently used bookmarks.
   BOOKMARKS,
 
   // Follows the last local category.
   LOCAL_CATEGORIES_COUNT,
 
   REMOTE_CATEGORIES_OFFSET = 10000,
 
   // Articles for you.
@@ skipping 25 matching lines @@
 
 bool operator==(const Category& left, const Category& right);
 
 bool operator!=(const Category& left, const Category& right);
 
 std::ostream& operator<<(std::ostream& os, const Category& obj);
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_CATEGORY_H_