Close idle connections / SPDY sessions when needed.

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 cdd71dcaf54ac7c1ac3f3b59440cd680d82d2d75..0543c89f79e73d213fb204ec040fe1fef8001544 100644
--- a/net/spdy/spdy_session.cc
+++ b/net/spdy/spdy_session.cc
@@ -332,6 +332,7 @@ net::Error SpdySession::InitializeWithSocket(
 
   state_ = CONNECTED;
   connection_.reset(connection);
+  connection_->AddLayeredPool(this);
   is_secure_ = is_secure;
   certificate_error_code_ = certificate_error_code;
 
@@ -980,6 +981,15 @@ int SpdySession::GetLocalAddress(IPEndPoint* address) const {
   return connection_->socket()->GetLocalAddress(address);
 }
 
+bool SpdySession::CloseOneIdleConnection() {
+  if (num_active_streams() == 0) {
+    // Should delete this.
+    RemoveFromPool();
+    return true;
+  }
+  return false;
+}
+
 void SpdySession::ActivateStream(SpdyStream* stream) {
   const spdy::SpdyStreamId id = stream->stream_id();
   DCHECK(!IsStreamActive(id));
@@ -1014,12 +1024,18 @@ void SpdySession::DeleteStream(spdy::SpdyStreamId id, int status) {
   if (stream)
     stream->OnClose(status);
   ProcessPendingCreateStreams();
+  if (num_active_streams() == 0 && connection_->is_initialized() &&
+      connection_->IsPoolStalled()) {
+    // Should delete this.
+    RemoveFromPool();
+  }
 }
 
 void SpdySession::RemoveFromPool() {
   if (spdy_session_pool_) {
-    spdy_session_pool_->Remove(make_scoped_refptr(this));
+    SpdySessionPool* pool = spdy_session_pool_;
     spdy_session_pool_ = NULL;
+    pool->Remove(make_scoped_refptr(this));
   }
 }