Add support for GCM cipher suites from RFC 7714.

webrtc/pc/channelmanager.h

Index: webrtc/pc/channelmanager.h
diff --git a/webrtc/pc/channelmanager.h b/webrtc/pc/channelmanager.h
index 72a2f056b5a4c0b6bb797f1a5792f575bb8a9ee3..ee21a3c23a6f42fb430ebfac7cec9b68a2789bad 100644
--- a/webrtc/pc/channelmanager.h
+++ b/webrtc/pc/channelmanager.h
@@ -112,6 +112,10 @@ class ChannelManager {
   // engines will start offering an RTX codec. Must be called before Init().
   bool SetVideoRtxEnabled(bool enable);
 
+  // Define crypto options to set on newly created channels. Doesn't change
+  // options on already created channels.
+  bool SetCryptoOptions(const rtc::CryptoOptions& crypto_options);
+
   // Starts/stops the local microphone and enables polling of the input level.
   bool capturing() const { return capturing_; }
 
@@ -142,6 +146,7 @@ class ChannelManager {
   bool InitMediaEngine_w();
   void DestructorDeletes_w();
   void Terminate_w();
+  bool SetCryptoOptions_w(const rtc::CryptoOptions& crypto_options);
   VoiceChannel* CreateVoiceChannel_w(
       webrtc::MediaControllerInterface* media_controller,
       TransportController* transport_controller,
@@ -174,6 +179,7 @@ class ChannelManager {
 
   int audio_output_volume_;
   bool enable_rtx_;
+  rtc::CryptoOptions crypto_options_;
 
   bool capturing_;
 };