Add generic functions for getting typed variation parameter values

chrome/browser/ntp_snippets/download_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 "chrome/browser/ntp_snippets/download_suggestions_provider.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/feature_list.h"
 #include "base/guid.h"
 #include "base/memory/ptr_util.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/ntp_snippets/features.h"
 #include "components/ntp_snippets/pref_names.h"
 #include "components/ntp_snippets/pref_util.h"
 #include "components/offline_pages/offline_page_model_query.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
+#include "components/variations/variations_associated_data.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/image/image.h"
 
 using content::DownloadItem;
 using content::DownloadManager;
 using ntp_snippets::Category;
 using ntp_snippets::CategoryInfo;
 using ntp_snippets::CategoryStatus;
 using ntp_snippets::ContentSuggestion;
 using ntp_snippets::prefs::kDismissedAssetDownloadSuggestions;
 using ntp_snippets::prefs::kDismissedOfflinePageDownloadSuggestions;
 using offline_pages::OfflinePageItem;
 using offline_pages::OfflinePageModelQuery;
 using offline_pages::OfflinePageModelQueryBuilder;
 
 namespace {
 
 const int kDefaultMaxSuggestionsCount = 5;
 const char kAssetDownloadsPrefix = 'D';
 const char kOfflinePageDownloadsPrefix = 'O';
 
 const char* kMaxSuggestionsCountParamName = "downloads_max_count";
 
 int GetMaxSuggestionsCount() {
   bool assets_enabled =
       base::FeatureList::IsEnabled(features::kAssetDownloadSuggestionsFeature);
-  return ntp_snippets::GetParamAsInt(
+  return variations::GetVariationParamByFeatureAsInt(
       assets_enabled ? features::kAssetDownloadSuggestionsFeature
                      : features::kOfflinePageDownloadSuggestionsFeature,
       kMaxSuggestionsCountParamName, kDefaultMaxSuggestionsCount);
 }
 
 std::string GetOfflinePagePerCategoryID(int64_t raw_offline_page_id) {
   // Raw ID is prefixed in order to avoid conflicts with asset downloads.
   return std::string(1, kOfflinePageDownloadsPrefix) +
          base::IntToString(raw_offline_page_id);
 }
@@ skipping 680 matching lines @@
 void DownloadSuggestionsProvider::UnregisterDownloadItemObservers() {
   DCHECK_NE(download_manager_, nullptr);
 
   std::vector<DownloadItem*> all_downloads;
   download_manager_->GetAllDownloads(&all_downloads);
 
   for (DownloadItem* item : all_downloads) {
     item->RemoveObserver(this);
   }
 }