Update json_schema_compiler to handle the Automation extension API

chrome/test/data/extensions/api_test/automation/tests/desktop/focus_views.js

 // 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.
 
 var allTests = [
   function testFocusLocationBar() {
     var firstFocusableNode = findAutomationNode(rootNode,
         function(node) {
           return node.role == 'textField' && node.state.focusable;
         });
 
     assertTrue(!!firstFocusableNode);
-    listenOnce(firstFocusableNode, EventType.focus, function(e) {
+    listenOnce(firstFocusableNode, EventType.FOCUS, function(e) {
       chrome.test.succeed();
     }, true);
     firstFocusableNode.focus();
   }
 ];
 
 setUpAndRunTests(allTests);