[Extensions] Precede api enums with an '_' if the first character is a digit

extensions/renderer/resources/binding.js

 // 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.
 
 var Event = require('event_bindings').Event;
 var forEach = require('utils').forEach;
 var GetAvailability = requireNative('v8_context').GetAvailability;
 var exceptionHandler = require('uncaught_exception_handler');
 var lastError = require('lastError');
 var logActivity = requireNative('activityLogger');
@@ skipping 289 matching lines @@
             // [{'name': 'foo'}, {'name': 'bar'}].
             enumValue = $Object.hasOwnProperty(enumValue, 'name') ?
                 enumValue.name : enumValue;
             if (enumValue) {  // Avoid setting any empty enums.
               // Make all properties in ALL_CAPS_STYLE.
               // Replace myEnum-Foo with my_Enum-Foo:
               var propertyName =
                   $String.replace(enumValue, /([a-z])([A-Z])/g, '$1_$2');
               // Replace my_Enum-Foo with my_Enum_Foo:
               propertyName = $String.replace(propertyName, /\W/g, '_');
+              // If the first character is a digit (we know it must be one of
+              // a digit, a letter, or an underscore), precede it with an
+              // underscore.
+              propertyName = $String.replace(propertyName, /^(\d)/g, '_$1');
               // Uppercase (replace my_Enum_Foo with MY_ENUM_FOO):
               propertyName = $String.toUpperCase(propertyName);
               mod[id][propertyName] = enumValue;
             }
           });
         }
       }, this);
     }
 
     // TODO(cduvall): Take out when all APIs have been converted to features.
@@ skipping 194 matching lines @@
                     availability.message);
       return;
     }
 
     this.runHooks_(mod);
     return mod;
   }
 };
 
 exports.Binding = Binding;