[OfflinePages] Hook the background loader offliner to the request coordinator based on finch flag settings.

This CL assumes that the background loader offliner can be re-used. Later changes will provide fix to this situation.

BUG=665242

Review-Url: https://codereview.chromium.org/2544533003
Cr-Commit-Position: refs/heads/master@{#440180}
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 7ccdd4b..3b9ad979 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -3123,6 +3123,8 @@
       "android/ntp/ntp_snippets_launcher.h",
       "android/offline_pages/background_loader_offliner.cc",
       "android/offline_pages/background_loader_offliner.h",
+      "android/offline_pages/background_loader_offliner_factory.cc",
+      "android/offline_pages/background_loader_offliner_factory.h",
       "android/offline_pages/background_scheduler_bridge.cc",
       "android/offline_pages/background_scheduler_bridge.h",
       "android/offline_pages/downloads/offline_page_download_bridge.cc",