Add ContentSuggestionsCategoryFactory; Store categories as ints

components/ntp_snippets/offline_pages/offline_page_suggestions_provider.cc

 // 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.
 
 #include "components/ntp_snippets/offline_pages/offline_page_suggestions_provider.h"
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
 
 using offline_pages::MultipleOfflinePageItemResult;
 using offline_pages::OfflinePageModel;
 using offline_pages::OfflinePageItem;
 
 namespace ntp_snippets {
 
 namespace {
 
 const int kMaxSuggestionsCount = 5;
 
 }  // namespace
 
 OfflinePageSuggestionsProvider::OfflinePageSuggestionsProvider(
+    ContentSuggestionsCategoryFactory* category_factory,
     OfflinePageModel* offline_page_model)
-    : ContentSuggestionsProvider({ContentSuggestionsCategory::OFFLINE_PAGES}),
+    : ContentSuggestionsProvider(category_factory),
       category_status_(ContentSuggestionsCategoryStatus::AVAILABLE_LOADING),
       observer_(nullptr),
-      offline_page_model_(offline_page_model) {
+      offline_page_model_(offline_page_model),
+      provided_category_(category_factory->FromKnownCategory(
+          KnownSuggestionsCategories::OFFLINE_PAGES)) {
   offline_page_model_->AddObserver(this);
 }
 
 OfflinePageSuggestionsProvider::~OfflinePageSuggestionsProvider() {}
 
 // Inherited from KeyedService.
 void OfflinePageSuggestionsProvider::Shutdown() {
   offline_page_model_->RemoveObserver(this);
   category_status_ = ContentSuggestionsCategoryStatus::NOT_PROVIDED;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Private methods
 
+std::vector<ContentSuggestionsCategory>
+OfflinePageSuggestionsProvider::GetProvidedCategories() {
+  return std::vector<ContentSuggestionsCategory>({provided_category_});
+}
+
 void OfflinePageSuggestionsProvider::SetObserver(
     ContentSuggestionsProvider::Observer* observer) {
   observer_ = observer;
   if (observer)
     FetchOfflinePages();
 }
 
 ContentSuggestionsCategoryStatus
 OfflinePageSuggestionsProvider::GetCategoryStatus(
     ContentSuggestionsCategory category) {
@@ skipping 48 matching lines @@
   NotifyStatusChanged(ContentSuggestionsCategoryStatus::AVAILABLE);
   if (!observer_)
     return;
 
   std::vector<ContentSuggestion> suggestions;
   for (const OfflinePageItem& item : result) {
     // TODO(pke): Make sure the URL is actually opened as an offline URL.
     // Currently, the browser opens the offline URL and then immediately
     // redirects to the online URL if the device is online.
     ContentSuggestion suggestion(
-        MakeUniqueID(ContentSuggestionsCategory::OFFLINE_PAGES,
-                     base::IntToString(item.offline_id)),
+        MakeUniqueID(provided_category_, base::IntToString(item.offline_id)),
         item.GetOfflineURL());
 
     // TODO(pke): Sort my most recently visited and only keep the top one of
     // multiple entries for the same URL.
     // TODO(pke): Get more reasonable data from the OfflinePageModel here.
     suggestion.set_title(item.url.spec());
     suggestion.set_snippet_text(std::string());
     suggestion.set_publish_date(item.creation_time);
     suggestion.set_publisher_name(item.url.host());
     suggestions.emplace_back(std::move(suggestion));
     if (suggestions.size() == kMaxSuggestionsCount)
       break;
   }
 
-  observer_->OnNewSuggestions(ContentSuggestionsCategory::OFFLINE_PAGES,
-                              std::move(suggestions));
+  observer_->OnNewSuggestions(provided_category_, std::move(suggestions));
 }
 
 void OfflinePageSuggestionsProvider::NotifyStatusChanged(
     ContentSuggestionsCategoryStatus new_status) {
   if (category_status_ == new_status)
     return;
   category_status_ = new_status;
 
   if (!observer_)
     return;
-  observer_->OnCategoryStatusChanged(ContentSuggestionsCategory::OFFLINE_PAGES,
-                                     new_status);
+  observer_->OnCategoryStatusChanged(provided_category_, new_status);
 }
 
 }  // namespace ntp_snippets