Gather metrics classifying the cause of the TLS fallback.

net/http/http_stream_factory.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_HTTP_HTTP_STREAM_FACTORY_H_
 #define NET_HTTP_HTTP_STREAM_FACTORY_H_
 
 #include <list>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "net/base/completion_callback.h"
 #include "net/base/load_states.h"
 #include "net/base/net_export.h"
 #include "net/base/request_priority.h"
 #include "net/http/http_server_properties.h"
 #include "net/socket/connection_attempts.h"
+#include "net/ssl/ssl_failure_state.h"
 // This file can be included from net/http even though
 // it is in net/websockets because it doesn't
 // introduce any link dependency to net/websockets.
 #include "net/websockets/websocket_handshake_stream_base.h"
 
 class GURL;
 
 namespace base {
 class Value;
 }
@@ skipping 49 matching lines @@
     // |used_proxy_info| indicates the actual ProxyInfo used for this stream,
     // since the HttpStreamRequest performs the proxy resolution.
     virtual void OnWebSocketHandshakeStreamReady(
         const SSLConfig& used_ssl_config,
         const ProxyInfo& used_proxy_info,
         WebSocketHandshakeStreamBase* stream) = 0;
 
     // This is the failure to create a stream case.
     // |used_ssl_config| indicates the actual SSL configuration used for this
     // stream, since the HttpStreamRequest may have modified the configuration
-    // during stream processing.
+    // during stream processing. If an SSL handshake failed, |ssl_failure_state|
+    // is the state the SSLClientSocket was in.
     virtual void OnStreamFailed(int status,
-                                const SSLConfig& used_ssl_config) = 0;
+                                const SSLConfig& used_ssl_config,
+                                SSLFailureState ssl_failure_state) = 0;
 
     // Called when we have a certificate error for the request.
     // |used_ssl_config| indicates the actual SSL configuration used for this
     // stream, since the HttpStreamRequest may have modified the configuration
     // during stream processing.
     virtual void OnCertificateError(int status,
                                     const SSLConfig& used_ssl_config,
                                     const SSLInfo& ssl_info) = 0;
 
     // This is the failure case where we need proxy authentication during
@@ skipping 138 matching lines @@
 
  private:
   static bool spdy_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpStreamFactory);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_STREAM_FACTORY_H_