Close idle H2 sockets when SpdySession is initialized.

net/spdy/spdy_session.cc

Index: net/spdy/spdy_session.cc
diff --git a/net/spdy/spdy_session.cc b/net/spdy/spdy_session.cc
index 431022624477c12cdb079655abc77cb9b7723f39..0173abd32538e3be1a3209c7b7f3f031590eed39 100644
--- a/net/spdy/spdy_session.cc
+++ b/net/spdy/spdy_session.cc
@@ -11,6 +11,7 @@
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
+#include "base/feature_list.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ -74,6 +75,10 @@ const uint32_t kDefaultInitialEnablePush = 1;
 const uint32_t kDefaultInitialInitialWindowSize = 65535;
 const uint32_t kDefaultInitialMaxFrameSize = 16384;
 
+// Experiment to close idle H2 sockets when SpdySession is initialized.
+const base::Feature kCloseIdleH2SocketsEarlyExperiment{
+    "CloseIdleH2SocketsEarly", base::FEATURE_DISABLED_BY_DEFAULT};
+
 bool IsSpdySettingAtDefaultInitialValue(SpdySettingsIds setting_id,
                                         uint32_t value) {
   switch (setting_id) {
@@ -900,6 +905,12 @@ void SpdySession::InitializeWithSocket(
     SendInitialData();
   pool_ = pool;
 
+  if (base::FeatureList::IsEnabled(kCloseIdleH2SocketsEarlyExperiment)) {
+    // Close idle sockets in this group, since subsequent requests will go over
+    // this HTTP/2 connection.
+    connection_->CloseIdleSocketsInGroup();
+  }
+
   // Bootstrap the read loop.
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,