Add 'import' and 'imageset' to WebURLRequest::RequestContext enum.

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 52 matching lines @@
         PriorityVeryLow,
         PriorityLow,
         PriorityMedium,
         PriorityHigh,
         PriorityVeryHigh,
     };
 
     // Corresponds to Fetch's "context": http://fetch.spec.whatwg.org/#concept-request-context
     enum RequestContext {
         RequestContextUnspecified = 0,
-        RequestContextInternal, // FIXME: This isn't part of Fetch. It should be.
         RequestContextAudio,
         RequestContextBeacon,
         RequestContextCSPReport,
         RequestContextDownload,
         RequestContextEmbed,
         RequestContextEventSource,
         RequestContextFavicon,
         RequestContextFetch,
         RequestContextFont,
         RequestContextForm,
         RequestContextFrame,
         RequestContextHyperlink,
         RequestContextIframe,
         RequestContextImage,
+        RequestContextImageSet,
+        RequestContextImport,
+        RequestContextInternal,
         RequestContextLocation,
         RequestContextManifest,
         RequestContextObject,
         RequestContextPing,
         RequestContextPlugin,
         RequestContextPrefetch,
         RequestContextScript,
         RequestContextServiceWorker,
         RequestContextSharedWorker,
         RequestContextSubresource,
@@ skipping 134 matching lines @@
 protected:
     BLINK_PLATFORM_EXPORT void assign(WebURLRequestPrivate*);
 
 private:
     WebURLRequestPrivate* m_private;
 };
 
 } // namespace blink
 
 #endif