[GN] Add a template which wraps generate_test_lists.py.

chromecast/browser/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//chromecast/chromecast.gni")
 import("//testing/test.gni")
 
 source_set("browser") {
   sources = [
     "cast_browser_context.cc",
@@ skipping 133 matching lines @@
   ]
 
   configs += [ ":browser_test_config" ]
 
   deps = [
     ":test_support",
     "//base",
     "//testing/gtest",
     "//url",
   ]
+
+  # TODO(slan): Find a better way to do this.
+  if (chromecast_branding != "public") {
+    deps += [ "//chromecast/internal:cast_shell_internal" ]
+  }
 }