Relanding: Allow the DTLS fingerprint verification to occur after the handshake.

webrtc/base/sslstreamadapter.h

Index: webrtc/base/sslstreamadapter.h
diff --git a/webrtc/base/sslstreamadapter.h b/webrtc/base/sslstreamadapter.h
index ba60ce3da09b32ce28b832597784cdaa78e0866a..968c21c5f7aa33823790a6b820a28a348a107efc 100644
--- a/webrtc/base/sslstreamadapter.h
+++ b/webrtc/base/sslstreamadapter.h
@@ -191,6 +191,12 @@ class SSLStreamAdapter : public StreamAdapterInterface {
   virtual bool SetDtlsSrtpCryptoSuites(const std::vector<int>& crypto_suites);
   virtual bool GetDtlsSrtpCryptoSuite(int* crypto_suite);
 
+  // Returns true if a TLS connection has been established.
+  // The only difference between this and "GetState() == SE_OPEN" is that if
+  // the peer certificate digest hasn't been verified, the state will still be
+  // SS_OPENING but IsTlsConnected should return true.
+  virtual bool IsTlsConnected() = 0;
+
   // Capabilities testing
   static bool HaveDtls();
   static bool HaveDtlsSrtp();