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 c6a67dfb0746dbfb931112003f83884031f73add..15a3752c44a730ae85ecaac07576825a990ffc8c 100644
--- a/webrtc/pc/channelmanager.h
+++ b/webrtc/pc/channelmanager.h
@@ -125,6 +125,10 @@ 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_; }
 
@@ -150,6 +154,7 @@ 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,
@@ -185,6 +190,7 @@ class ChannelManager {
   DataChannels data_channels_;
 
   bool enable_rtx_;
+  rtc::CryptoOptions crypto_options_;
 
   bool capturing_;
 };