Modify PeerConnection for end-to-end QuicDataChannel usage

webrtc/p2p/base/sessiondescription.h

Index: webrtc/p2p/base/sessiondescription.h
diff --git a/webrtc/p2p/base/sessiondescription.h b/webrtc/p2p/base/sessiondescription.h
index 788016756948c1f298a17cbb87d7fb5d39cd7b3e..0ca50cf0c02b90abbd3f01e0362311230fb91034 100644
--- a/webrtc/p2p/base/sessiondescription.h
+++ b/webrtc/p2p/base/sessiondescription.h
@@ -163,12 +163,15 @@ class SessionDescription {
   // Global attributes.
   void set_msid_supported(bool supported) { msid_supported_ = supported; }
   bool msid_supported() const { return msid_supported_; }
+  void set_quic(bool use_quic) { quic_ = use_quic; }
+  bool quic() const { return quic_; }
 
  private:
   ContentInfos contents_;
   TransportInfos transport_infos_;
   ContentGroups content_groups_;
   bool msid_supported_ = true;
+  bool quic_ = false;
 };
 
 // Indicates whether a ContentDescription was an offer or an answer, as