Add tests for braille commands.

chrome/test/base/js2gtest.gni

Index: chrome/test/base/js2gtest.gni
diff --git a/chrome/test/base/js2gtest.gni b/chrome/test/base/js2gtest.gni
index 213e7b5ba5580de50fbd37715805ba3927432dc0..e8034906ea37917b9ff378c61c08bfae7933f71f 100644
--- a/chrome/test/base/js2gtest.gni
+++ b/chrome/test/base/js2gtest.gni
@@ -35,6 +35,9 @@ template("js2gtest") {
     if (defined(invoker.deps_js)) {
       inputs += [ invoker.deps_js ]
     }
+    if (defined(invoker.extra_gen_files)) {
+      inputs += invoker.extra_gen_files
+    }
 
     # Outputs. The script will copy the source files to the output directory,
     # which then must be treated as runtime data. The generated .cc file isn't