Pass the sctp command-line flag to Libjingle as an internal-only constraint.

content/renderer/media/rtc_peer_connection_handler.cc

 // Copyright (c) 2012 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/rtc_peer_connection_handler.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
+#include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "base/utf_string_conversions.h"
+#include "content/public/common/content_switches.h"
 #include "content/renderer/media/media_stream_dependency_factory.h"
 #include "content/renderer/media/peer_connection_tracker.h"
 #include "content/renderer/media/remote_media_stream_impl.h"
 #include "content/renderer/media/rtc_data_channel_handler.h"
 #include "content/renderer/media/rtc_dtmf_sender_handler.h"
 #include "content/renderer/media/rtc_media_constraints.h"
 #include "content/renderer/render_thread_impl.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebMediaConstraints.h"
 // TODO(hta): Move the following include to WebRTCStatsRequest.h file.
 #include "third_party/WebKit/Source/Platform/chromium/public/WebMediaStreamSource.h"
@@ skipping 314 matching lines @@
     const WebKit::WebMediaConstraints& options) {
   DCHECK(frame_);
 
   peer_connection_tracker_ =
       RenderThreadImpl::current()->peer_connection_tracker();
 
   webrtc::PeerConnectionInterface::IceServers servers;
   GetNativeIceServers(server_configuration, &servers);
 
   RTCMediaConstraints constraints(options);
+
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableSCTPDataChannels)) {
+    // TODO(jiayl): replace the hard coded string with
+    // webrtc::MediaConstraintsInterface::kEnableSctpDataChannels when
+    // the Libjingle change is rolled.
+    constraints.AddOptional("internalSctpDataChannels", "true");
+  }
+
   native_peer_connection_ =
       dependency_factory_->CreatePeerConnection(
           servers, &constraints, frame_, this);
   if (!native_peer_connection_) {
     LOG(ERROR) << "Failed to initialize native PeerConnection.";
     return false;
   }
   if (peer_connection_tracker_)
     peer_connection_tracker_->RegisterPeerConnection(
         this, servers, constraints, frame_);
@@ skipping 390 matching lines @@
   webrtc::SessionDescriptionInterface* native_desc =
       dependency_factory_->CreateSessionDescription(type, sdp, error);
 
   LOG_IF(ERROR, !native_desc) << "Failed to create native session description."
                               << " Type: " << type << " SDP: " << sdp;
 
   return native_desc;
 }
 
 }  // namespace content