Fix bug where requests to QUIC servers were throttled by the resource scheduler.

net/http/http_server_properties_impl.cc

Index: net/http/http_server_properties_impl.cc
diff --git a/net/http/http_server_properties_impl.cc b/net/http/http_server_properties_impl.cc
index d048e98871acba04071ccae2c0c81d51d494bc26..2ffaa711b65105e258ea395f687a1be18b2a305c 100644
--- a/net/http/http_server_properties_impl.cc
+++ b/net/http/http_server_properties_impl.cc
@@ -168,7 +168,7 @@ void HttpServerPropertiesImpl::Clear() {
   server_network_stats_map_.Clear();
 }
 
-bool HttpServerPropertiesImpl::SupportsSpdy(
+bool HttpServerPropertiesImpl::SupportsRequestPriority(
     const HostPortPair& host_port_pair) {
   DCHECK(CalledOnValidThread());
   if (host_port_pair.host().empty())
@@ -176,9 +176,14 @@ bool HttpServerPropertiesImpl::SupportsSpdy(
 
   SpdyServerHostPortMap::iterator spdy_host_port =
       spdy_servers_map_.Get(host_port_pair.ToString());
-  if (spdy_host_port != spdy_servers_map_.end())
-    return spdy_host_port->second;
-  return false;
+  if (spdy_host_port != spdy_servers_map_.end() && spdy_host_port->second)
+    return true;
+
+  if (!HasAlternateProtocol(host_port_pair))
+    return false;
+
+  AlternateProtocolInfo info = GetAlternateProtocol(host_port_pair);
+  return info.protocol == QUIC;
 }
 
 void HttpServerPropertiesImpl::SetSupportsSpdy(