Add new feature flag to enable background loader for downloads

chrome/browser/android/chrome_feature_list.cc

 // Copyright 2015 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/android/chrome_feature_list.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 32 matching lines @@
     &kNTPFakeOmniboxTextFeature,
     &kNTPMaterialDesign,
     &kNTPOfflinePagesFeature,
     &kNTPToolbarFeature,
     &kPhysicalWebFeature,
     &kPhysicalWebIgnoreOtherClientsFeature,
     &kReadItLaterInMenu,
     &kSystemDownloadManager,
     &kTabReparenting,
     &offline_pages::kOfflinePagesBackgroundLoadingFeature,
+    &offline_pages::kBackgroundLoaderForDownloadsFeature,

[dougarnett, 2016/08/19 00:19:24]

wondering about slight better name. per chat suggestion from dimich, might be
kUseBackgroundLoaderForDownloads* but I also wonder about
kAllowBackgroundLoadingForDownloads* since is not prescriptive on how the
Download request will be satisfied (merely one option).

     &offline_pages::kOfflinePagesCTFeature,  // See crbug.com/620421.
     &offline_pages::kOfflinePagesSharingFeature,
     &password_manager::features::kViewPasswords,
 };
 
 }  // namespace
 
 const base::Feature kAllBookmarksFeature{"AllBookmarks",
                                          base::FEATURE_ENABLED_BY_DEFAULT};
 
@@ skipping 46 matching lines @@
   NOTREACHED();
   return false;
 }
 
 bool RegisterChromeFeatureListJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace chrome