Create list file for GN target //remoting/webapp:unit_tests

remoting/webapp/BUILD.gn

Index: remoting/webapp/BUILD.gn
diff --git a/remoting/webapp/BUILD.gn b/remoting/webapp/BUILD.gn
index 78620a8d7c0566101b9edb6c6254e047d4ab904a..9b1a78028a49a1ba59c1728eb3c247d8068a0437 100644
--- a/remoting/webapp/BUILD.gn
+++ b/remoting/webapp/BUILD.gn
@@ -125,11 +125,22 @@ action("build_unittest") {
   outputs = [
     "$remoting_unit_test_out_dir/unittests.html",
   ]
-  args = rebase_path(outputs, root_build_dir) + [
-           rebase_path(remoting_webapp_unittests_template_main, root_build_dir),
-           "--exclude-js",
-         ] + rebase_path(remoting_webapp_unittests_exclude_js_files,
-                         root_build_dir) + [ "--js" ] +
-         rebase_path(remoting_webapp_unittests_all_js_files, root_build_dir) +
-         [ "--instrument-js" ] + rebase_path(webapp_js_files, root_build_dir)
+
+  # Create a file that contains a list of all the JavaScript files needed
+  # to build the unit test page. This is needed to avoid problems on platforms
+  # that limit the size of a command line.
+  file_list = "$target_gen_dir/remoting_webapp_unittest_files.txt"
+  files = rebase_path(remoting_webapp_unittests_all_js_files, root_build_dir)
+  write_file(file_list, files)
+
+  args =
+      rebase_path(outputs, root_build_dir) + [
+        rebase_path(remoting_webapp_unittests_template_main, root_build_dir),
+        "--exclude-js",
+      ] +
+      rebase_path(remoting_webapp_unittests_exclude_js_files, root_build_dir) +
+      [
+        "--js-list-file",
+        rebase_path(file_list, root_build_dir),
+      ] + [ "--instrument-js" ] + rebase_path(webapp_js_files, root_build_dir)
 }