relnote: QUIC header streams support to receive PUSH_PROMISE. Protected by --quic_supports_push_pr…

net/quic/quic_headers_stream.h

Index: net/quic/quic_headers_stream.h
diff --git a/net/quic/quic_headers_stream.h b/net/quic/quic_headers_stream.h
index 385650e985d6969b5b92b6322c12bd3898fabbe7..bee753d5a3f6d64852b424495c6fb559b2e4f4af 100644
--- a/net/quic/quic_headers_stream.h
+++ b/net/quic/quic_headers_stream.h
@@ -18,9 +18,10 @@ namespace net {
 
 class QuicSpdySession;
 
-// Headers in QUIC are sent as HTTP/2 HEADERS frames over a reserved reliable
-// stream with the id 3.  Each endpoint (client and server) will allocate an
-// instance of QuicHeadersStream to send and receive headers.
+// Headers in QUIC are sent as HTTP/2 HEADERS or PUSH_PROMISE frames
+// over a reserved reliable stream with the id 3.  Each endpoint
+// (client and server) will allocate an instance of QuicHeadersStream
+// to send and receive headers.
 class NET_EXPORT_PRIVATE QuicHeadersStream : public ReliableQuicStream {
  public:
   explicit QuicHeadersStream(QuicSpdySession* session);
@@ -47,6 +48,8 @@ class NET_EXPORT_PRIVATE QuicHeadersStream : public ReliableQuicStream {
   void OnDataAvailable() override;
   SpdyPriority Priority() const override;
 
+  bool supports_push_promise() { return supports_push_promise_; }
+
  private:
   class SpdyFramerVisitor;
 
@@ -58,6 +61,11 @@ class NET_EXPORT_PRIVATE QuicHeadersStream : public ReliableQuicStream {
                  SpdyPriority priority,
                  bool fin);
 
+  // Called when a PUSH_PROMISE frame has been received.
+  void OnPushPromise(SpdyStreamId stream_id,
+                     SpdyStreamId promised_stream_id,
+                     bool end);
+
   // Called when a chunk of header data is available. This is called
   // after OnHeaders.
   // |stream_id| The stream receiving the header data.
@@ -78,11 +86,13 @@ class NET_EXPORT_PRIVATE QuicHeadersStream : public ReliableQuicStream {
 
   // Data about the stream whose headers are being processed.
   QuicStreamId stream_id_;
+  QuicStreamId promised_stream_id_;
   bool fin_;
   size_t frame_len_;
 
-  // Helper variable that caches the corresponding feature flag.
+  // Helper variables that cache the corresponding feature flag.
   bool measure_headers_hol_blocking_time_;
+  bool supports_push_promise_;
 
   // Timestamps used to measure HOL blocking, these are recorded by
   // the sequencer approximate to the time of arrival off the wire.