Server push cancellation: add a finch trial parameter

net/http/http_cache.cc

 // Copyright (c) 2012 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/http/http_cache.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 17 matching lines @@
 #include "base/threading/worker_pool.h"
 #include "base/time/default_clock.h"
 #include "base/time/time.h"
 #include "net/base/cache_type.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/base/upload_data_stream.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/http/disk_cache_based_quic_server_info.h"
+#include "net/http/http_cache_lookup_manager.h"
 #include "net/http/http_cache_transaction.h"
 #include "net/http/http_network_layer.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_response_info.h"
 #include "net/http/http_util.h"
 #include "net/log/net_log_with_source.h"
 #include "net/quic/chromium/quic_server_info.h"
 
@@ skipping 263 matching lines @@
       bypass_lock_for_test_(false),
       fail_conditionalization_for_test_(false),
       mode_(NORMAL),
       network_layer_(std::move(network_layer)),
       clock_(new base::DefaultClock()),
       weak_factory_(this) {
   HttpNetworkSession* session = network_layer_->GetSession();
   // Session may be NULL in unittests.
   // TODO(mmenke): Seems like tests could be changed to provide a session,
   // rather than having logic only used in unit tests here.
   if (session) {

[Ryan Hamilton, 2017/02/16 15:15:07]

nit: as long as you're here:

if (!session)
  return;

net_log_ = session->net_log();
if (!is_main_cache)
  return

...

[Zhongyi Shi, 2017/02/19 20:19:53]

Done.

     net_log_ = session->net_log();
-    if (is_main_cache &&
-        !session->quic_stream_factory()->has_quic_server_info_factory()) {
+    if (!is_main_cache)
+      return;
+
+    session->SetServerPushDelegate(
+        base::MakeUnique<HttpCacheLookupManager>(this));
+
+    if (!session->quic_stream_factory()->has_quic_server_info_factory()) {
       // QuicStreamFactory takes ownership of QuicServerInfoFactoryAdaptor.
       session->quic_stream_factory()->set_quic_server_info_factory(
           new QuicServerInfoFactoryAdaptor(this));
     }
   }
 }
 
 HttpCache::~HttpCache() {
   // Transactions should see an invalid cache after this point; otherwise they
   // could see an inconsistent object (half destroyed).
@@ skipping 821 matching lines @@
     building_backend_ = false;
     DeletePendingOp(pending_op);
   }
 
   // The cache may be gone when we return from the callback.
   if (!item->DoCallback(result, disk_cache_.get()))
     item->NotifyTransaction(result, NULL);
 }
 
 }  // namespace net