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Prior to this change, the host will always make at least two service
calls, one to heartbeat and one to log that it heartbeated.  This
dance is left over from the design which used Buzz as the signaling
channel.  Since both heartbeat and log calls go to the same service
API now, there isn't much value in having two separate calls.

In this CL, we will add a couple of fields to the heartbeat message
and populate them for every heartbeat.  The backend service will
determine whether or not they need to be persisted in the Directory.

Change-Id: I6f1f9ca18b903c63a36ad78ec1bc94869db64dd7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2170174
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Auto-Submit: Joe Downing <joedow@chromium.org>
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763583}