[WebSocket] Merge duplicated HTTP headers for devtools

Source/platform/network/WebSocketHandshakeRequest.h

 /*
  * Copyright (C) 2010 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebSocketHandshakeRequest_h
 #define WebSocketHandshakeRequest_h
 
 #include "platform/network/HTTPRequest.h"
 
 namespace WebCore {
 
+class HTTPHeaderMap;
+
 class PLATFORM_EXPORT WebSocketHandshakeRequest : public HTTPRequest {
 public:
     static PassRefPtr<WebSocketHandshakeRequest> create(const String& requestMethod, const KURL& url) { return adoptRef(new WebSocketHandshakeRequest(requestMethod, url)); }
     static PassRefPtr<WebSocketHandshakeRequest> create() { return adoptRef(new WebSocketHandshakeRequest); }
     ~WebSocketHandshakeRequest();
 
+    void addAndMergeHeader(const AtomicString& name, const AtomicString& value) { addAndMergeHeader(&m_headerFields, name, value); }
+
+    // Merges the existing value with |value| in |map| if |map| already has |name|.
+    // Associates |value| with |name| in |map| otherwise.
+    // This function builds data for inspector.
+    static void addAndMergeHeader(HTTPHeaderMap* /* map */, const AtomicString& name, const AtomicString& value);
+
 private:
     WebSocketHandshakeRequest(const String& requestMethod, const KURL&);
     WebSocketHandshakeRequest();
 };
 
 } // namespace WebCore
 
 #endif // WebSocketHandshakeRequest_h