Add an async ReadTrailers method to QuicChromiumClientStream::Handle

net/quic/chromium/quic_http_stream.h

Index: net/quic/chromium/quic_http_stream.h
diff --git a/net/quic/chromium/quic_http_stream.h b/net/quic/chromium/quic_http_stream.h
index be8833c4a5796aac8e578153389e930bb7020e70..562a076d27a3d3dcd85d310b0dece04d50dde430 100644
--- a/net/quic/chromium/quic_http_stream.h
+++ b/net/quic/chromium/quic_http_stream.h
@@ -69,8 +69,6 @@ class NET_EXPORT_PRIVATE QuicHttpStream
   void SetPriority(RequestPriority priority) override;
 
   // QuicChromiumClientStream::Delegate implementation
-  void OnTrailingHeadersAvailable(const SpdyHeaderBlock& headers,
-                                  size_t frame_len) override;
   void OnClose() override;
   void OnError(int error) override;
 
@@ -123,6 +121,8 @@ class NET_EXPORT_PRIVATE QuicHttpStream
 
   void OnReadResponseHeadersComplete(int rv);
   int ProcessResponseHeaders(const SpdyHeaderBlock& headers);
+  void ReadTrailingHeaders();
+  void OnReadTrailingHeadersComplete(int rv);
 
   void OnReadBodyComplete(int rv);
   int HandleReadComplete(int rv);
@@ -184,6 +184,9 @@ class NET_EXPORT_PRIVATE QuicHttpStream
   SpdyHeaderBlock response_header_block_;
   bool response_headers_received_;
 
+  SpdyHeaderBlock trailing_header_block_;
+  bool trailing_headers_received_;
+
   // Number of bytes received by the headers stream on behalf of this stream.
   int64_t headers_bytes_received_;
   // Number of bytes sent by the headers stream on behalf of this stream.