Add commandline flag to enable GCM cipher suites from RFC 7714 in WebRTC.

content/renderer/media/webrtc/peer_connection_dependency_factory.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/webrtc/peer_connection_dependency_factory.h"
 
 #include <stddef.h>
 
 #include <utility>
 #include <vector>
@@ skipping 243 matching lines @@
       worker_thread_, signaling_thread_, audio_device_.get(),
       webrtc::CreateBuiltinAudioEncoderFactory(),
       webrtc::CreateBuiltinAudioDecoderFactory(), encoder_factory.release(),
       decoder_factory.release());
   CHECK(pc_factory_.get());
 
   webrtc::PeerConnectionFactoryInterface::Options factory_options;
   factory_options.disable_sctp_data_channels = false;
   factory_options.disable_encryption =
       cmd_line->HasSwitch(switches::kDisableWebRtcEncryption);
-
+  factory_options.crypto_options.enable_gcm_crypto_suites =
+      cmd_line->HasSwitch(switches::kEnableWebRtcSrtpAesGcm);
   pc_factory_->SetOptions(factory_options);
 
   event->Signal();
 }
 
 bool PeerConnectionDependencyFactory::PeerConnectionFactoryCreated() {
   return pc_factory_.get() != NULL;
 }
 
 scoped_refptr<webrtc::PeerConnectionInterface>
@@ skipping 278 matching lines @@
 
 void PeerConnectionDependencyFactory::EnsureWebRtcAudioDeviceImpl() {
   DCHECK(CalledOnValidThread());
   if (audio_device_.get())
     return;
 
   audio_device_ = new WebRtcAudioDeviceImpl();
 }
 
 }  // namespace content