[Extern Generation] Normify extern enum property names

tools/json_schema_compiler/js_externs_generator_test.py

 #!/usr/bin/env python
 # 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 idl_schema
 import json_parse
 from js_externs_generator import JsExternsGenerator
 from datetime import datetime
 import model
@@ skipping 145 matching lines @@
 
 
 fake_json = """// Copyright 2014 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.
 
 [
   {
     "namespace": "fakeJson",
     "description": "Fake JSON API Stuff",
+    "types": [ {
+      "id": "CrazyEnum",
+      "type": "string",
+      "enum": ["camelCaseEnum", "Non-Characters", "5NumFirst", \
+"3Just-plainOld_MEAN"]
+    } ],
     "functions": [ {
       "name": "funcWithInlineObj",
       "type": "function",
       "parameters": [
         {
           "type": "object",
           "name": "inlineObj",
           "description": "Evil inline object! With a super duper duper long\
  string description that causes problems!",
           "properties": {
@@ skipping 48 matching lines @@
 // found in the LICENSE file.
 
 /** @fileoverview Externs generated from namespace: fakeJson */
 
 /**
  * @const
  */
 chrome.fakeJson = {};
 
 /**
+ * @enum {string}
+ * @see https://developer.chrome.com/extensions/fakeJson#type-CrazyEnum
+ */
+chrome.fakeJson.CrazyEnum = {
+  CAMEL_CASE_ENUM: 'camelCaseEnum',
+  NON_CHARACTERS: 'Non-Characters',
+  _5NUM_FIRST: '5NumFirst',
+  _3JUST_PLAIN_OLD_MEAN: '3Just-plainOld_MEAN',
+};
+
+/**
  * @param {{
  *   foo: (boolean|undefined),
  *   bar: number,
  *   baz: {
  *     depth: number
  *   }
  * }} inlineObj Evil inline object! With a super duper duper long string
  *     description that causes problems!
  * @param {function({
  *   str: string
@@ skipping 25 matching lines @@
                               JsExternsGenerator().Generate(namespace).Render())
 
   def testJsonWithInlineObjects(self):
     namespace = self._GetNamespace(fake_json, 'fake_api.json', False)
     self.assertMultiLineEqual(json_expected,
                               JsExternsGenerator().Generate(namespace).Render())
 
 
 if __name__ == '__main__':
   unittest.main()