QUIC: retransmit packets with the correct encryption.

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index d4f23ded364300a31c439470a5c443e3263c9c27..a48cba75b2b3838aeaa72e3e3bc215549f9fea01 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -461,6 +461,18 @@ struct NET_EXPORT_PRIVATE QuicGoAwayFrame {
   std::string reason_phrase;
 };
 
+// EncryptionLevel enumerates the stages of encryption that a QUIC connection
+// progresses through. When retransmitting a packet, the encryption level needs
+// to be specified so that it is retransmitted at a level which the peer can
+// understand.
+enum EncryptionLevel {
+  ENCRYPTION_NONE = 0,
+  ENCRYPTION_INITIAL = 1,
+  ENCRYPTION_FORWARD_SECURE = 2,
+
+  NUM_ENCRYPTION_LEVELS,
+};
+
 struct NET_EXPORT_PRIVATE QuicFrame {
   QuicFrame() {}
   explicit QuicFrame(QuicPaddingFrame* padding_frame)
@@ -628,8 +640,14 @@ class NET_EXPORT_PRIVATE RetransmittableFrames {
   const QuicFrame& AddNonStreamFrame(const QuicFrame& frame);
   const QuicFrames& frames() const { return frames_; }
 
+  void set_encryption_level(EncryptionLevel level);
+  EncryptionLevel encryption_level() const {
+    return encryption_level_;
+  }
+
  private:
   QuicFrames frames_;
+  EncryptionLevel encryption_level_;
   // Data referenced by the StringPiece of a QuicStreamFrame.
   std::vector<std::string*> stream_data_;