Log how often DTLS negotiation failed because of incompatible ciphersuites.

webrtc/base/sslstreamadapter.cc

Index: webrtc/base/sslstreamadapter.cc
diff --git a/webrtc/base/sslstreamadapter.cc b/webrtc/base/sslstreamadapter.cc
index 44158d401f984862aba07ce0cc24773f0b6c35ff..400c6295a0effe27424d102fb0615e1a3b24e61f 100644
--- a/webrtc/base/sslstreamadapter.cc
+++ b/webrtc/base/sslstreamadapter.cc
@@ -50,6 +50,13 @@ SSLStreamAdapter* SSLStreamAdapter::Create(StreamInterface* stream) {
 #endif  // SSL_USE_OPENSSL
 }
 
+SSLStreamAdapter::SSLStreamAdapter(StreamInterface* stream)
+    : StreamAdapterInterface(stream),
+      ignore_bad_cert_(false),
+      client_auth_enabled_(true) {}
+
+SSLStreamAdapter::~SSLStreamAdapter() {}
+
 bool SSLStreamAdapter::GetSslCipherSuite(int* cipher_suite) {
   return false;
 }