Perform ClientHello padding if the field trial is enabled

net/ssl/ssl_config.h

Index: net/ssl/ssl_config.h
diff --git a/net/ssl/ssl_config.h b/net/ssl/ssl_config.h
index 2cbc99568bc170877a45514cffa3d5f771e773b3..2158cf1b9bda36703024c4b00650b233e74eb313 100644
--- a/net/ssl/ssl_config.h
+++ b/net/ssl/ssl_config.h
@@ -159,6 +159,14 @@ struct NET_EXPORT SSLConfig {
   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