Add tests for braille commands.

chrome/browser/resources/chromeos/chromevox/BUILD.gn

Index: chrome/browser/resources/chromeos/chromevox/BUILD.gn
diff --git a/chrome/browser/resources/chromeos/chromevox/BUILD.gn b/chrome/browser/resources/chromeos/chromevox/BUILD.gn
index 1538cc8b0f9a75b29247faa8418a436b8e047feb..2f4d577f3281f392602badb54ee08a17611b437d 100644
--- a/chrome/browser/resources/chromeos/chromevox/BUILD.gn
+++ b/chrome/browser/resources/chromeos/chromevox/BUILD.gn
@@ -377,6 +377,8 @@ generate_deps_js("chromevox_test_deps_js") {
 js2gtest("chromevox_unitjs_tests") {
   test_type = "webui"
   sources = chromevox_tests_gypi_values.chromevox_tests_unitjs_sources
+  extra_gen_files =
+      chromevox_tests_gypi_values.chromevox_tests_unit_extra_js_sources
   test_deps_js_outputs = get_target_outputs(":chromevox_test_deps_js")
   deps_js = test_deps_js_outputs[0]
   deps = [
@@ -389,5 +391,7 @@ js2gtest("chromevox_extjs_tests") {
   test_type = "extension"
   sources = chromevox_tests_gypi_values.chromevox_tests_extjs_sources
   sources -= [ "braille/liblouis_test.extjs" ]  # TODO(GYP)
+  extra_gen_files =
+      chromevox_tests_gypi_values.chromevox_tests_ext_extra_js_sources
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
 }