[ios] Add session saving support to clean skeleton.

ios/shared/chrome/browser/ui/browser_list/BUILD.gn

Index: ios/shared/chrome/browser/ui/browser_list/BUILD.gn
diff --git a/ios/shared/chrome/browser/ui/browser_list/BUILD.gn b/ios/shared/chrome/browser/ui/browser_list/BUILD.gn
index 5e010701a6929c5792ff2cf3a848acf5cd4fd32c..43231579e6947a4987a22a0d3f8137395a655212 100644
--- a/ios/shared/chrome/browser/ui/browser_list/BUILD.gn
+++ b/ios/shared/chrome/browser/ui/browser_list/BUILD.gn
@@ -10,17 +10,27 @@ source_set("browser_list") {
     "browser_list.mm",
     "browser_list_observer.h",
     "browser_list_observer.mm",
+    "browser_list_session_service.h",
+    "browser_list_session_service_factory.h",
+    "browser_list_session_service_factory.mm",
+    "browser_list_session_service_impl.h",
+    "browser_list_session_service_impl.mm",
     "browser_web_state_list_delegate.h",
     "browser_web_state_list_delegate.mm",
   ]
   deps = [
     "//base",
+    "//components/keyed_service/core",
+    "//components/keyed_service/ios",
+    "//ios/chrome/browser",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/find_in_page",
     "//ios/chrome/browser/sessions",
+    "//ios/chrome/browser/sessions:serialisation",
     "//ios/chrome/browser/ssl",
     "//ios/chrome/browser/web_state_list",
     "//ios/shared/chrome/browser/ui/commands",
+    "//ios/web",
   ]
   configs += [ "//build/config/compiler:enable_arc" ]
 }