Add an options page to Select-to-Speak and allow setting voice name, rate

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

 # Copyright 2016 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("//build/config/features.gni")
 import("//testing/test.gni")
 import("//chrome/test/base/js2gtest.gni")
 import("//chrome/browser/resources/chromeos/chromevox/run_jsbundler.gni")
 
 assert(is_chromeos)
 
 select_to_speak_out_dir = "$root_out_dir/resources/chromeos/select_to_speak"
 
 group("select_to_speak") {
   deps = [
     ":select_to_speak_copied_files",
     ":select_to_speak_guest_manifest",
     ":select_to_speak_manifest",
     "//chrome/browser/resources/chromeos/select_to_speak/strings:select_to_speak_strings",
   ]
 }
 
 # Instead of setting up one copy target for each subdirectory, use a script
 # to copy all files.
 run_jsbundler("select_to_speak_copied_files") {
   mode = "copy"
   dest_dir = select_to_speak_out_dir
   sources = [
+    "checked.png",
+    "options.css",
+    "options.html",
     "select_to_speak.js",
+    "select_to_speak_main.js",
+    "select_to_speak_options.js",
+    "unchecked.png",
   ]
   rewrite_rules = [
     rebase_path(".", root_build_dir) + ":",
     rebase_path(closure_library_dir, root_build_dir) + ":closure",
   ]
 }
 
 # TODO: refactor this into another file like generate_manifest.gni
 # to share with other extensions.
 template("manifest") {
@@ skipping 27 matching lines @@
 }
 
 manifest("select_to_speak_manifest") {
   output_file = "$select_to_speak_out_dir/manifest.json"
 }
 
 manifest("select_to_speak_guest_manifest") {
   output_file = "$select_to_speak_out_dir/manifest_guest.json"
   is_guest_manifest = true
 }