Add support for GCM cipher suites from RFC 7714.

webrtc/p2p/base/dtlstransportchannel.h

 /*
  *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 105 matching lines @@
     return channel_->GetOption(opt, value);
   }
   int GetError() override { return channel_->GetError(); }
   bool GetStats(ConnectionInfos* infos) override {
     return channel_->GetStats(infos);
   }
   const std::string SessionId() const override { return channel_->SessionId(); }
 
   virtual bool SetSslMaxProtocolVersion(rtc::SSLProtocolVersion version);
 
+  virtual bool SetEnableGcmCiphers(bool enable);
+
+  bool IsEnableGcmCiphers() const override;
+
   // Set up the ciphers to use for DTLS-SRTP. If this method is not called
   // before DTLS starts, or |ciphers| is empty, SRTP keys won't be negotiated.
   // This method should be called before SetupDtls.
   bool SetSrtpCryptoSuites(const std::vector<int>& ciphers) override;
 
   // Find out which DTLS-SRTP cipher was negotiated
   bool GetSrtpCryptoSuite(int* cipher) override;
 
   bool GetSslRole(rtc::SSLRole* role) const override;
   bool SetSslRole(rtc::SSLRole role) override;
@@ skipping 86 matching lines @@
   rtc::Thread* worker_thread_;  // Everything should occur on this thread.
   // Underlying channel, owned by transport_.
   TransportChannelImpl* const channel_;
   rtc::scoped_ptr<rtc::SSLStreamAdapter> dtls_;  // The DTLS stream
   StreamInterfaceChannel* downward_;  // Wrapper for channel_, owned by dtls_.
   std::vector<int> srtp_ciphers_;     // SRTP ciphers to use with DTLS.
   bool dtls_active_ = false;
   rtc::scoped_refptr<rtc::RTCCertificate> local_certificate_;
   rtc::SSLRole ssl_role_;
   rtc::SSLProtocolVersion ssl_max_version_;
+  bool enable_gcm_ciphers_;
   rtc::Buffer remote_fingerprint_value_;
   std::string remote_fingerprint_algorithm_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(DtlsTransportChannelWrapper);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_DTLSTRANSPORTCHANNEL_H_