Server push cancellation: add PushPromiseHelper which reflects information on the push promise.

net/tools/quic/test_tools/push_promise_delegate.cc

+// Copyright 2016 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 "net/tools/quic/test_tools/push_promise_delegate.h"
+
+namespace net {
+namespace test {
+PushPromiseDelegate::PushPromiseDelegate(bool match)
+    : match_(match), rendezvous_fired_(false), rendezvous_stream_(nullptr) {}
+
+bool PushPromiseDelegate::CheckVary(const SpdyHeaderBlock& client_request,
+                                    const SpdyHeaderBlock& promise_request,
+                                    const SpdyHeaderBlock& promise_response) {
+  DVLOG(1) << "match " << match_;
+  return match_;
+}
+
+void PushPromiseDelegate::OnRendezvousResult(QuicSpdyStream* stream) {
+  rendezvous_fired_ = true;
+  rendezvous_stream_ = stream;
+}
+
+}  // namespace test
+}  // namespace net