Accept new WebTransport sessions over HTTP/3.

PiperOrigin-RevId: 362614422
Change-Id: I08c3572279ac3bee29d1da62dde520808fb1321e

quic/core/http/web_transport_http3.cc

diff --git a/quic/core/http/web_transport_http3.cc b/quic/core/http/web_transport_http3.cc
new file mode 100644
index 0000000..0c7c9a8
--- /dev/null
+++ b/quic/core/http/web_transport_http3.cc
@@ -0,0 +1,75 @@
+// Copyright 2021 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "quic/core/http/web_transport_http3.h"
+
+#include <memory>
+
+#include "quic/core/http/quic_spdy_session.h"
+#include "quic/core/http/quic_spdy_stream.h"
+
+namespace quic {
+
+namespace {
+class QUIC_EXPORT_PRIVATE NoopWebTransportVisitor : public WebTransportVisitor {
+  void OnSessionReady() override {}
+  void OnIncomingBidirectionalStreamAvailable() override {}
+  void OnIncomingUnidirectionalStreamAvailable() override {}
+  void OnDatagramReceived(absl::string_view /*datagram*/) override {}
+  void OnCanCreateNewOutgoingBidirectionalStream() override {}
+  void OnCanCreateNewOutgoingUnidirectionalStream() override {}
+};
+}  // namespace
+
+WebTransportHttp3::WebTransportHttp3(QuicSpdySession* session,
+                                     QuicSpdyStream* connect_stream,
+                                     WebTransportSessionId id)
+    : session_(session),
+      connect_stream_(connect_stream),
+      id_(id),
+      visitor_(std::make_unique<NoopWebTransportVisitor>()) {}
+
+void WebTransportHttp3::HeadersReceived(
+    const spdy::SpdyHeaderBlock& /*headers*/) {
+  ready_ = true;
+  visitor_->OnSessionReady();
+}
+
+WebTransportStream* WebTransportHttp3::AcceptIncomingBidirectionalStream() {
+  // TODO(vasilvv): implement this.
+  return nullptr;
+}
+WebTransportStream* WebTransportHttp3::AcceptIncomingUnidirectionalStream() {
+  // TODO(vasilvv): implement this.
+  return nullptr;
+}
+
+bool WebTransportHttp3::CanOpenNextOutgoingBidirectionalStream() {
+  // TODO(vasilvv): implement this.
+  return false;
+}
+bool WebTransportHttp3::CanOpenNextOutgoingUnidirectionalStream() {
+  // TODO(vasilvv): implement this.
+  return false;
+}
+WebTransportStream* WebTransportHttp3::OpenOutgoingBidirectionalStream() {
+  // TODO(vasilvv): implement this.
+  return nullptr;
+}
+WebTransportStream* WebTransportHttp3::OpenOutgoingUnidirectionalStream() {
+  // TODO(vasilvv): implement this.
+  return nullptr;
+}
+
+MessageStatus WebTransportHttp3::SendOrQueueDatagram(
+    QuicMemSlice /*datagram*/) {
+  // TODO(vasilvv): implement this.
+  return MessageStatus::MESSAGE_STATUS_UNSUPPORTED;
+}
+void WebTransportHttp3::SetDatagramMaxTimeInQueue(
+    QuicTime::Delta /*max_time_in_queue*/) {
+  // TODO(vasilvv): implement this.
+}
+
+}  // namespace quic