Enables PacketGenerator's use of PacketCreator's FEC primitives.

net/quic/quic_packet_creator.h

Index: net/quic/quic_packet_creator.h
diff --git a/net/quic/quic_packet_creator.h b/net/quic/quic_packet_creator.h
index 0e198879f936be4d4d618d10615277b158b4ae97..238f26ee59ab825193c510db8fc41fbc68440eca 100644
--- a/net/quic/quic_packet_creator.h
+++ b/net/quic/quic_packet_creator.h
@@ -56,6 +56,9 @@ class NET_EXPORT_PRIVATE QuicPacketCreator : public QuicFecBuilderInterface {
   // return true if an FEC group is open.
   bool ShouldSendFec(bool force_close) const;
 
+  // Returns true if an FEC packet is under construction.
+  bool IsFecGroupOpen() const;
+
   // Makes the framer not serialize the protocol version in sent packets.
   void StopSendingVersion();
 
@@ -111,7 +114,7 @@ class NET_EXPORT_PRIVATE QuicPacketCreator : public QuicFecBuilderInterface {
       const QuicFrames& frames, QuicSequenceNumberLength original_length);
 
   // Returns true if there are frames pending to be serialized.
-  bool HasPendingFrames();
+  bool HasPendingFrames() const;
 
   // Returns whether FEC protection is currently enabled. Note: Enabled does not
   // mean that an FEC group is currently active; i.e., IsFecProtected() may