Negotiate the same SRTP crypto suites for every DTLS association formed.

webrtc/base/sslstreamadapter.cc

Index: webrtc/base/sslstreamadapter.cc
diff --git a/webrtc/base/sslstreamadapter.cc b/webrtc/base/sslstreamadapter.cc
index 2f601c625791b4ee1f152bf7a39b33ab62bc7f2e..62f893fcdcccef77dcd6c762f49d6f918a49e52f 100644
--- a/webrtc/base/sslstreamadapter.cc
+++ b/webrtc/base/sslstreamadapter.cc
@@ -95,6 +95,15 @@ CryptoOptions CryptoOptions::NoGcm() {
   return options;
 }
 
+void GetDefaultSrtpCryptoSuites(const rtc::CryptoOptions& crypto_options,
+                                std::vector<int>* crypto_suites) {
+  if (crypto_options.enable_gcm_crypto_suites) {
+    crypto_suites->push_back(rtc::SRTP_AEAD_AES_256_GCM);
+    crypto_suites->push_back(rtc::SRTP_AEAD_AES_128_GCM);
+  }
+  crypto_suites->push_back(rtc::SRTP_AES128_CM_SHA1_80);
+}
+
 SSLStreamAdapter* SSLStreamAdapter::Create(StreamInterface* stream) {
   return new OpenSSLStreamAdapter(stream);
 }