borealis: Add browser tests for the installer

Added browser tests for the Borealis installer view.

Cq-Depend: 2391891
Tests: Ran tests
Bug: b:161650651
Change-Id: I2e5e6a2fb5d744f1fd3cd2f0e6efa1622953c0ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392285
Commit-Queue: Daniel Ng <danielng@google.com>
Reviewed-by: Collin Baker <collinbaker@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Nic Hollingum <hollingum@google.com>
Cr-Commit-Position: refs/heads/master@{#805151}

chrome/test/BUILD.gn

@@ -2608,6 +2608,7 @@ if (!is_android) {
         "../browser/ui/views/apps/app_dialog/app_uninstall_dialog_view_browsertest.cc",
         "../browser/ui/views/apps/chrome_native_app_window_views_aura_ash_browsertest.cc",
         "../browser/ui/views/arc_app_dialog_view_browsertest.cc",
+        "../browser/ui/views/borealis/borealis_installer_view_browsertest.cc",
         "../browser/ui/views/crostini/crostini_ansible_software_config_view_browsertest.cc",
         "../browser/ui/views/crostini/crostini_browser_test_util.cc",
         "../browser/ui/views/crostini/crostini_browser_test_util.h",