Add a CRYPTO_BUFFER_POOL to SSLClientSocketImpl.

net/cert/x509_util_openssl.h

Index: net/cert/x509_util_openssl.h
diff --git a/net/cert/x509_util_openssl.h b/net/cert/x509_util_openssl.h
index b735c1ac21afd771bef9dd36fac9bceb849e4697..791abaf580b2cdb4405a6dfb657a292db0629b5f 100644
--- a/net/cert/x509_util_openssl.h
+++ b/net/cert/x509_util_openssl.h
@@ -51,6 +51,9 @@ bool NET_EXPORT ParseDate(ASN1_TIME* x509_time, base::Time* time);
 // after the first call to this function.
 bool NET_EXPORT GetDER(X509* x509, base::StringPiece* out_der);
 
+// Returns a CRYPTO_BUFFER_POOL for deduplicating certificates.
+CRYPTO_BUFFER_POOL* GetBufferPool();
+
 } // namespace x509_util
 
 } // namespace net