WritePingFrame   2420 net/spdy/spdy_session.cc     WritePingFrame(unique_id, true);
WritePingFrame   2665 net/spdy/spdy_session.cc   WritePingFrame(next_ping_id_, false);
WritePingFrame    672 net/spdy/spdy_session.h   void WritePingFrame(uint32 unique_id, bool is_ack);
WritePingFrame   1035 net/spdy/spdy_session_unittest.cc   session->WritePingFrame(1, false);