Add support for GCM cipher suites from RFC 7714.

talk/session/media/channelmanager.h

Index: talk/session/media/channelmanager.h
diff --git a/talk/session/media/channelmanager.h b/talk/session/media/channelmanager.h
index f69bf9a2935c2a25bca79a555e2e3e49a4118031..65f6182e5d00f13551e6710b9f09950b97bcb66f 100644
--- a/talk/session/media/channelmanager.h
+++ b/talk/session/media/channelmanager.h
@@ -132,6 +132,7 @@ class ChannelManager : public rtc::MessageHandler,
   // RTX will be enabled/disabled in engines that support it. The supporting
   // engines will start offering an RTX codec. Must be called before Init().
   bool SetVideoRtxEnabled(bool enable);
+  bool SetCryptoOptions(const rtc::CryptoOptions& crypto_options);
 
   // Starts/stops the local microphone and enables polling of the input level.
   bool capturing() const { return capturing_; }
@@ -231,6 +232,7 @@ class ChannelManager : public rtc::MessageHandler,
   int audio_output_volume_;
   VideoRenderer* local_renderer_;
   bool enable_rtx_;
+  rtc::CryptoOptions crypto_options_;
 
   bool capturing_;
 };