Send PING to check the status of the SPDY connection.

net/base/net_log_event_type_list.h

 // Copyright (c) 2011 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.
 
 // NOTE: No header guards are used, since this file is intended to be expanded
 // directly into net_log.h. DO NOT include this file anywhere else.
 
 // In the event of a failure, a many end events will have a |net_error|
 // parameter with the integer error code associated with the failure.  Most
 // of these parameters are not individually documented.
@@ skipping 833 matching lines @@
 EVENT_TYPE(SPDY_SESSION_RST_STREAM)
 
 // Sending of a RST_STREAM
 // The following parameters are attached:
 //   {
 //     "stream_id": <The stream ID for the window update>,
 //     "status": <The reason for the RST_STREAM>,
 //   }
 EVENT_TYPE(SPDY_SESSION_SEND_RST_STREAM)
 
+// Sending of a SPDY PING frame.
+// The following parameters are attached:
+//   {
+//     "unique_id": <The unique_id of the PING message>,

[willchan no longer on Chromium, 2011/10/13 06:38:39]

You don't need the underscore in the description of the key.

[ramant (doing other things), 2011/10/13 21:41:14]

Done.

+//   }
+EVENT_TYPE(SPDY_SESSION_PING)
+
 // Receipt of a SPDY GOAWAY frame.
 // The following parameters are attached:
 //   {
 //     "last_accepted_stream_id": <Last stream id accepted by the server, duh>,
 //     "active_streams":          <Number of active streams>,
 //     "unclaimed_streams":       <Number of unclaimed push streams>,
 //   }
 EVENT_TYPE(SPDY_SESSION_GOAWAY)
 
 // Receipt of a SPDY WINDOW_UPDATE frame (which controls the send window).
@@ skipping 353 matching lines @@
 
 // ------------------------------------------------------------------------
 // HostBlacklistManager
 // ------------------------------------------------------------------------
 
 // TODO(joaodasilva): Layering violation, see comment above.
 // http://crbug.com/90674.
 
 // This event is created when a request is blocked by a policy.
 EVENT_TYPE(CHROME_POLICY_ABORTED_REQUEST)