Start collecting two new WebSocket histograms.

Source/modules/websockets/WebSocketHandshake.h

 /*
  * Copyright (C) 2011 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 28 matching lines @@
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class ScriptExecutionContext;
 
 class WebSocketHandshake {
     WTF_MAKE_NONCOPYABLE(WebSocketHandshake); WTF_MAKE_FAST_ALLOCATED;
 public:
+    // This enum is reused for histogram. When this needs to be modified, add a
+    // new enum for histogram and convert mode values into values in the new
+    // enum to keep new data consistent with old one.
     enum Mode {
-        Incomplete, Normal, Failed, Connected
+        Incomplete, Normal, Failed, Connected, ModeMax
     };
     WebSocketHandshake(const KURL&, const String& protocol, ScriptExecutionContext*);
     ~WebSocketHandshake();
 
     const KURL& url() const;
     void setURL(const KURL&);
     const String host() const;
 
     const String& clientProtocol() const;
     void setClientProtocol(const String&);
 
     bool secure() const;
 
     String clientOrigin() const;
     String clientLocation() const;
 
     CString clientHandshakeMessage() const;
     PassRefPtr<WebSocketHandshakeRequest> clientHandshakeRequest() const;
 
+    // We're collecting data for histogram in the destructor. Note that calling
+    // this method affects that.
     void reset();
     void clearScriptExecutionContext();
 
     int readServerHandshake(const char* header, size_t len);
     Mode mode() const;
     String failureReason() const; // Returns a string indicating the reason of failure if mode() == Failed.
 
     String serverWebSocketProtocol() const;
     String serverSetCookie() const;
     String serverSetCookie2() const;
@@ skipping 31 matching lines @@
 
     String m_secWebSocketKey;
     String m_expectedAccept;
 
     WebSocketExtensionDispatcher m_extensionDispatcher;
 };
 
 } // namespace WebCore
 
 #endif // WebSocketHandshake_h