[Offline pages] Create offliner that uses background loader

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index ba93142fd4b616889bcd3b50aa8ba0c41c737ebc..2ecb9eaa31f9c1e76a0cf4ffbe82c7c2889ee001 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -3505,6 +3505,7 @@ test("unit_tests") {
   if (is_android) {
     sources += [
       # Offline pages are currently only on Android.
+      "../browser/android/offline_pages/background_loader_offliner_unittest.cc",
       "../browser/android/offline_pages/offline_page_mhtml_archiver_unittest.cc",
       "../browser/android/offline_pages/offline_page_request_job_unittest.cc",
       "../browser/android/offline_pages/offline_page_utils_unittest.cc",
@@ -3528,6 +3529,7 @@ test("unit_tests") {
       ":unit_tests_java",
       "//components/gcm_driver/instance_id/android:instance_id_driver_java",
       "//components/gcm_driver/instance_id/android:instance_id_driver_test_support_java",
+      "//components/offline_pages/content/background_loader:test_support",
       "//components/offline_pages/core:test_support",
       "//components/offline_pages/core/background:test_support",
       "//v8:v8_external_startup_data_assets",