Perform ClientHello padding if the field trial is enabled

net/ssl/ssl_config.h

 // Copyright 2014 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_SSL_SSL_CONFIG_H_
 #define NET_SSL_SSL_CONFIG_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "net/base/net_export.h"
@@ skipping 141 matching lines @@
 
   // The list of application level protocols supported. If set, this will
   // enable Next Protocol Negotiation (if supported). The order of the
   // protocols doesn't matter expect for one case: if the server supports Next
   // Protocol Negotiation, but there is no overlap between the server's and
   // client's protocol sets, then the first protocol in this list will be
   // requested by the client.
   NextProtoVector next_protos;
 
   scoped_refptr<X509Certificate> client_cert;
+
+  // Information about how to proceed with fastradio padding.
+  // |enable_fastradio_padding| determines if the feature is enabled globally;
+  // |fastradio_padding_eligible| determines if a given endpoint should use it.
+  // |fastradio_padding_eligible| can be true when |enable_fastradio_padding| is
+  // false - in that case, fastradio padding will not be used.

[jeremyim, 2015/02/03 05:42:47]

There are two bools here to capture 3 states we care about (for measuring the
error rate in the experiment) in SSLClientSocketOpenSSL:
- Use fast radio padding (and log to Net.SSL_Connection_Error_ClientPadding)
- Don't use fast radio padding (and log to
Net.SSL_Connection_Error_ClientPadding since it was "eligible" but not
"enabled")
- Don't use fast radio padding (don't log to
Net.SSL_Connection_Error_ClientPadding since it wasn't eligible)

In this case, eligible means passing the google.com domain check, while enabled
means whether the session was part of the field trial.

+  bool enable_fastradio_padding;
+  bool fastradio_padding_eligible;
 };
 
 }  // namespace net
 
 #endif  // NET_SSL_SSL_CONFIG_H_