Add a value for end-to-end reloads in Cache policy

public/platform/WebURLRequest.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
 class WebURL;
 class WebURLRequestPrivate;
 
 class WebURLRequest {
 public:
     enum CachePolicy {
         UseProtocolCachePolicy, // normal load
         ReloadIgnoringCacheData, // reload
         ReturnCacheDataElseLoad, // back/forward or encoding change - allow stale data
         ReturnCacheDataDontLoad, // results of a post - allow stale data and only use cache
+        ReloadBypassingCache, // shift reload
     };
 
     enum Priority {
         PriorityUnresolved = -1,
         PriorityVeryLow,
         PriorityLow,
         PriorityMedium,
         PriorityHigh,
         PriorityVeryHigh,
     };
@@ skipping 136 matching lines @@
 protected:
     BLINK_PLATFORM_EXPORT void assign(WebURLRequestPrivate*);
 
 private:
     WebURLRequestPrivate* m_private;
 };
 
 } // namespace blink
 
 #endif