Add support for GCM cipher suites from RFC 7714.

webrtc/pc/channelmanager.cc

Index: webrtc/pc/channelmanager.cc
diff --git a/webrtc/pc/channelmanager.cc b/webrtc/pc/channelmanager.cc
index f59a3df9c72f7059e0c1a66aed639a66e2dbe518..3dc6dcd7d3ee3abe9af9f454a1804c80d1af6abb 100644
--- a/webrtc/pc/channelmanager.cc
+++ b/webrtc/pc/channelmanager.cc
@@ -99,6 +99,12 @@ bool ChannelManager::SetVideoRtxEnabled(bool enable) {
   }
 }
 
+bool ChannelManager::SetCryptoOptions(
+    const rtc::CryptoOptions& crypto_options) {
+  crypto_options_ = crypto_options;

[mattdr, 2016/05/06 22:34:14]

Maybe this should fail or log if there are active channels? API consumers might
imagine this will change the crypto on existing channels, instead of them
keeping a copy of this state.

Could also consider renaming this to, say, SetCryptoSetupOptions.

[joachim, 2016/05/09 23:21:40]

Done (added warning log and comment in header but didn't rename).

+  return true;
+}
+
 void ChannelManager::GetSupportedAudioCodecs(
     std::vector<AudioCodec>* codecs) const {
   codecs->clear();
@@ -230,6 +236,7 @@ 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;
@@ -288,6 +295,7 @@ 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;
@@ -346,6 +354,7 @@ 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;