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API which enables the exchange short messages with nearby devices.

This is the audio handling code of the copresence core component. We'll be
open sourcing this code in phases, this is the first part. This CL includes
the code for the directive handler for copresence, and all related classes.
Including blundell@ for the OWNERs review to add this component.

R=dalecurtis@chromium.org, derat@chromium.org, jochen@chromium.org, xiyuan@chromium.org, blundell@chromium.org
BUG=365493

Review URL: https://codereview.chromium.org/419073002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287900 0039d316-1c4b-4281-b951-d872f2087c98