dbus: Add test_server.cc used for manual testing.

dbus: Add test_server.cc used for manual testing.

The server was used for investigating crbug.com/126217.
end_to_end_async_unittest.cc runs both the server and the client
in the same process. It's useful to have a server program
that runs as a separate process.

BUG=none
TEST=out/Debug/dbus_test_server; (from another terminal) dbus-send  --print-reply --type=method_call --dest=org.chromium.TestService /org/chromium/TestObject org.chromium.TestInterface.SlowEcho string:hello

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=141023

[hashimoto, 2012-06-07 01:35:16]

lgtm

This test server is added to help developers doing manual tests, right?
Is it possible to launch this server from dbus_unittests and use it in
end_to_end_async_unittest?

[satorux1, 2012-06-07 16:45:03]

On 2012/06/07 01:35:16, hashimoto wrote:
> lgtm
> 
> This test server is added to help developers doing manual tests, right?
> Is it possible to launch this server from dbus_unittests and use it in
> end_to_end_async_unittest?

I thought about it but not sure it's easily done (i.e. how do we launch the
binary from the test?) but it's a good thing to do. I'll file a bug.