Apply automatic range checks to content enum types across IPC.

storage/common/quota/quota_status_code.h

 // Copyright 2013 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.
 
 #ifndef STORAGE_COMMON_QUOTA_QUOTA_STATUS_CODE_H_
 #define STORAGE_COMMON_QUOTA_QUOTA_STATUS_CODE_H_
 
 #include "storage/common/storage_common_export.h"
 #include "third_party/WebKit/public/platform/WebStorageQuotaError.h"
 
 namespace storage {
 
 enum QuotaStatusCode {
   kQuotaStatusOk = 0,
   kQuotaErrorNotSupported = blink::WebStorageQuotaErrorNotSupported,
   kQuotaErrorInvalidModification =
       blink::WebStorageQuotaErrorInvalidModification,
   kQuotaErrorInvalidAccess = blink::WebStorageQuotaErrorInvalidAccess,
   kQuotaErrorAbort = blink::WebStorageQuotaErrorAbort,
   kQuotaStatusUnknown = -1,
+
+  kQuotaStatusLast = kQuotaStatusUnknown,

[dcheng, 2015/04/23 17:40:49]

This is -1. This will filter out a lot of legitimate values of
WebStorageQuotaError.

 };
 
 STORAGE_COMMON_EXPORT const char* QuotaStatusCodeToString(
     QuotaStatusCode status);
 
 }  // namespace storage
 
 #endif  // STORAGE_COMMON_QUOTA_QUOTA_STATUS_CODE_H_