Add support for GCM cipher suites from RFC 7714.

talk/app/webrtc/peerconnection.cc

Index: talk/app/webrtc/peerconnection.cc
diff --git a/talk/app/webrtc/peerconnection.cc b/talk/app/webrtc/peerconnection.cc
index beae77097836474083ef0afec7955cdf5fe2c52f..e553c15565c24877de6042d321c6447f61661832 100644
--- a/talk/app/webrtc/peerconnection.cc
+++ b/talk/app/webrtc/peerconnection.cc
@@ -1535,6 +1535,7 @@ bool PeerConnection::GetOptionsForOffer(
   if (session_->data_channel_type() == cricket::DCT_SCTP && HasDataChannels()) {
     session_options->data_channel_type = cricket::DCT_SCTP;
   }
+  session_options->crypto_options = factory_->options().crypto_options;
   return true;
 }
 
@@ -1559,6 +1560,7 @@ bool PeerConnection::GetOptionsForAnswer(
   if (session_->data_channel_type() == cricket::DCT_SCTP) {
     session_options->data_channel_type = cricket::DCT_SCTP;
   }
+  session_options->crypto_options = factory_->options().crypto_options;
   return true;
 }