Re-land: Update json_schema_compiler to handle the Automation extension API

chrome/browser/resources/chromeos/chromevox/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("//build/config/features.gni")
 import("//chrome/common/features.gni")
 import("//testing/test.gni")
 import("//chrome/test/base/js2gtest.gni")
 import("run_jsbundler.gni")
 
@@ skipping 112 matching lines @@
   "cvox2/background/automation_object_constructor_installer.js",
   "cvox2/background/automation_predicate.js",
   "cvox2/background/automation_util.js",
   "cvox2/background/background.js",
   "cvox2/background/base_automation_handler.js",
   "cvox2/background/braille_command_handler.js",
   "cvox2/background/chromevox_state.js",
   "cvox2/background/command_handler.js",
   "cvox2/background/constants.js",
   "cvox2/background/cursors.js",
+  "cvox2/background/custom_automation_event.js",
   "cvox2/background/desktop_automation_handler.js",
   "cvox2/background/earcon_engine.js",
   "cvox2/background/editing.js",
   "cvox2/background/find_handler.js",
   "cvox2/background/i_search.js",
   "cvox2/background/keyboard_handler.js",
   "cvox2/background/live_regions.js",
   "cvox2/background/media_automation_handler.js",
   "cvox2/background/next_earcons.js",
   "cvox2/background/notifications.js",
@@ skipping 540 matching lines @@
   ]
   gen_include_files = [
     "testing/assert_additions.js",
     "testing/callback_helper.js",
     "testing/chromevox_e2e_test_base.js",
     "testing/chromevox_next_e2e_test_base.js",
     "testing/mock_feedback.js",
   ]
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
 }