De-client TestRequestTracker

De-client TestRequestTracker

This interface is used with to run the mojo_shell_tests which run a
variety of services and send tracking information back and forth. The
TestRequestTracker's Client was used for one back-and-forth that
exchanged a string in one direction and a uint64 in the other. This
inverts the direction in which the two are sent which cuts out an
extra callback + message jump and renames TestRequestTrackerClientImpl
to TrackedService to more closely match (I think) the intention.

BUG=451319
R=viettrungluu@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/51b4cd64822b49971b9033220ef1062e45f08f53

[jamesr, 2015-02-03 22:14:32]

jamesr@chromium.org changed reviewers:
+ viettrungluu@chromium.org

[jamesr, 2015-02-03 22:14:33]

Git log (eventually) says you're responsible for this test.

[viettrungluu, 2015-02-04 00:27:35]

I think Tim actually wrote nearly all of this, but rubberstamp lgtm (w/nit).

https://codereview.chromium.org/901463002/diff/1/services/test_service/test_r...
File services/test_service/test_request_tracker_impl.cc (right):

https://codereview.chromium.org/901463002/diff/1/services/test_service/test_r...
services/test_service/test_request_tracker_impl.cc:12:
TrackingContext::~TrackingContext() {
nit: blank line above

[jamesr, 2015-02-04 19:27:45]

Committed patchset #1 (id:1) manually as
51b4cd64822b49971b9033220ef1062e45f08f53 (presubmit successful).