Log source_dependency in HTTP2_SESSION_SEND_HEADERS.

net/spdy/spdy_stream.h

Index: net/spdy/spdy_stream.h
diff --git a/net/spdy/spdy_stream.h b/net/spdy/spdy_stream.h
index 816c7bc825d3e63cdfcde4d550d89e193be470a4..b3d3245830e95a7a2316d1187cd14a08dbc41755 100644
--- a/net/spdy/spdy_stream.h
+++ b/net/spdy/spdy_stream.h
@@ -19,6 +19,7 @@
 #include "net/base/io_buffer.h"
 #include "net/base/net_export.h"
 #include "net/base/request_priority.h"
+#include "net/log/net_log_source.h"
 #include "net/log/net_log_with_source.h"
 #include "net/socket/next_proto.h"
 #include "net/socket/ssl_client_socket.h"
@@ -102,6 +103,8 @@ class NET_EXPORT_PRIVATE SpdyStream {
     // handle it gracefully.
     virtual void OnClose(int status) = 0;
 
+    virtual NetLogSource source_dependency() const = 0;
+
    protected:
     virtual ~Delegate() {}