Server push cancellation: add a finch trial parameter

net/http/http_cache.cc

Index: net/http/http_cache.cc
diff --git a/net/http/http_cache.cc b/net/http/http_cache.cc
index ccded67606f609db8bce433b09614b4766c130fb..2b236ea30dea3ca47191d916b633509e410d4cac 100644
--- a/net/http/http_cache.cc
+++ b/net/http/http_cache.cc
@@ -35,6 +35,7 @@
 #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"
@@ -320,8 +321,13 @@ HttpCache::HttpCache(std::unique_ptr<HttpTransactionFactory> network_layer,
   // 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));