Add unit tests for AddToHomescreenDataFetcher

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index be7d4db8c8c263a6bf120a4766ad32b28907cc51..6df8d9a3f087d100e4e21e708d5be510bf5621c1 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1559,8 +1559,8 @@ test("browser_tests") {
       "../browser/interstitials/security_interstitial_page_test_utils.h",
       "../browser/invalidation/profile_invalidation_provider_factory_browsertest.cc",
       "../browser/lifetime/browser_close_manager_browsertest.cc",
-      "../browser/loadtimes_extension_bindings_browsertest.cc",
       "../browser/loader/chrome_resource_dispatcher_host_delegate_browsertest.cc",
+      "../browser/loadtimes_extension_bindings_browsertest.cc",
       "../browser/locale_tests_browsertest.cc",
       "../browser/media/defer_background_media_browsertest.cc",
       "../browser/media/encrypted_media_browsertest.cc",
@@ -3009,6 +3009,7 @@ test("unit_tests") {
     "../browser/android/webapk/webapk_icon_hasher_unittest.cc",
     "../browser/android/webapk/webapk_installer_unittest.cc",
     "../browser/android/webapk/webapk_web_manifest_checker_unittest.cc",
+    "../browser/android/webapps/add_to_homescreen_data_fetcher_unittest.cc",
     "../browser/app_controller_mac_unittest.mm",
     "../browser/autocomplete/search_provider_unittest.cc",
     "../browser/autocomplete/shortcuts_provider_extension_unittest.cc",