Add support for GCM cipher suites from RFC 7714.

talk/session/media/channelmanager.cc

Index: talk/session/media/channelmanager.cc
diff --git a/talk/session/media/channelmanager.cc b/talk/session/media/channelmanager.cc
index bd89a41328cb345728bdec0912b4f230a3242a94..3324fb710ce02641d0f03e762d41e0091a151019 100644
--- a/talk/session/media/channelmanager.cc
+++ b/talk/session/media/channelmanager.cc
@@ -142,6 +142,12 @@ bool ChannelManager::SetVideoRtxEnabled(bool enable) {
   }
 }
 
+bool ChannelManager::SetCryptoOptions(
+    const rtc::CryptoOptions& crypto_options) {
+  crypto_options_ = crypto_options;
+  return true;
+}
+
 void ChannelManager::GetSupportedAudioCodecs(
     std::vector<AudioCodec>* codecs) const {
   codecs->clear();
@@ -275,6 +281,7 @@ VoiceChannel* ChannelManager::CreateVoiceChannel_w(
   VoiceChannel* voice_channel =
       new VoiceChannel(worker_thread_, media_engine_.get(), media_channel,
                        transport_controller, content_name, rtcp);
+  voice_channel->SetCryptoOptions(crypto_options_);
   if (!voice_channel->Init()) {
     delete voice_channel;
     return nullptr;
@@ -333,6 +340,7 @@ VideoChannel* ChannelManager::CreateVideoChannel_w(
 
   VideoChannel* video_channel = new VideoChannel(
       worker_thread_, media_channel, transport_controller, content_name, rtcp);
+  video_channel->SetCryptoOptions(crypto_options_);
   if (!video_channel->Init()) {
     delete video_channel;
     return NULL;
@@ -391,6 +399,7 @@ DataChannel* ChannelManager::CreateDataChannel_w(
 
   DataChannel* data_channel = new DataChannel(
       worker_thread_, media_channel, transport_controller, content_name, rtcp);
+  data_channel->SetCryptoOptions(crypto_options_);
   if (!data_channel->Init()) {
     LOG(LS_WARNING) << "Failed to init data channel.";
     delete data_channel;