Fetch API: Add Request#cache attribute

third_party/WebKit/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 103 matching lines @@
     kFetchRequestModeNavigate
   };
 
   enum FetchCredentialsMode {
     kFetchCredentialsModeOmit,
     kFetchCredentialsModeSameOrigin,
     kFetchCredentialsModeInclude,
     kFetchCredentialsModePassword
   };
 
+  enum FetchRequestCacheMode {
+    kFetchRequestCacheModeDefault,
+    kFetchRequestCacheModeNoStore,
+    kFetchRequestCacheModeReload,
+    kFetchRequestCacheModeNoCache,
+    kFetchRequestCacheModeForceCache,
+    kFetchRequestCacheModeOnlyIfCached
+  };
+
   enum FetchRedirectMode {
     kFetchRedirectModeFollow,
     kFetchRedirectModeError,
     kFetchRedirectModeManual
   };
 
   // Used to report performance metrics timed from the UI action that
   // triggered them (as opposed to navigation start time used in the
   // Navigation Timing API).
   enum InputToLoadPerfMetricReportPolicy {
@@ skipping 231 matching lines @@
   // instance it contains.
   std::unique_ptr<ResourceRequestContainer> owned_resource_request_;
 
   // Should never be null.
   ResourceRequest* resource_request_;
 };
 
 }  // namespace blink
 
 #endif