Expose OpenSSL's key_exchange_info in the content API

content/browser/loader/resource_loader.cc

Index: content/browser/loader/resource_loader.cc
diff --git a/content/browser/loader/resource_loader.cc b/content/browser/loader/resource_loader.cc
index 22e776ca5d9704a72ed0b333c5cc15896d1b30f8..22244b8414ca54d55b88f218ce341e702a09e112 100644
--- a/content/browser/loader/resource_loader.cc
+++ b/content/browser/loader/resource_loader.cc
@@ -77,6 +77,7 @@ void GetSSLStatusForRequest(const GURL& url,
   ssl_status->cert_id = cert_id;
   ssl_status->cert_status = ssl_info.cert_status;
   ssl_status->security_bits = ssl_info.security_bits;
+  ssl_status->key_exchange_info = ssl_info.key_exchange_info;
   ssl_status->connection_status = ssl_info.connection_status;
   ssl_status->signed_certificate_timestamp_ids =
       signed_certificate_timestamp_ids;
@@ -121,6 +122,7 @@ void PopulateResourceResponse(ResourceRequestInfoImpl* info,
     // We should not have any SSL state.
     DCHECK(!request->ssl_info().cert_status &&
            request->ssl_info().security_bits == -1 &&
+           request->ssl_info().key_exchange_info == 0 &&
            !request->ssl_info().connection_status);
   }
 }