cros: Enable WebUILoginView reuse.

chrome/browser/chromeos/BUILD.gn

Index: chrome/browser/chromeos/BUILD.gn
diff --git a/chrome/browser/chromeos/BUILD.gn b/chrome/browser/chromeos/BUILD.gn
index e4f52d70d4409afcba8568f1c521e8d808f61eac..472faae11df02e1f56c0811aa0507ac53f086166 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -877,6 +877,10 @@ source_set("chromeos") {
     "login/ui/models/user_board_model.cc",
     "login/ui/models/user_board_model.h",
     "login/ui/proxy_settings_dialog.cc",
+    "login/ui/shared_web_view.cc",
+    "login/ui/shared_web_view.h",
+    "login/ui/shared_web_view_factory.cc",
+    "login/ui/shared_web_view_factory.h",
     "login/ui/simple_web_view_dialog.cc",
     "login/ui/simple_web_view_dialog.h",
     "login/ui/user_adding_screen.cc",
@@ -885,6 +889,8 @@ source_set("chromeos") {
     "login/ui/user_adding_screen_input_methods_controller.h",
     "login/ui/web_contents_set_background_color.cc",
     "login/ui/web_contents_set_background_color.h",
+    "login/ui/web_view_handle.cc",
+    "login/ui/web_view_handle.h",
     "login/ui/webui_login_display.cc",
     "login/ui/webui_login_display.h",
     "login/ui/webui_login_view.cc",