Mojo: Add a "remote" channel endpoint ID generator.

Mojo: Add a "remote" channel endpoint ID generator.

(But don't use it yet.)

Also change the terminology slightly, and just use the all-around
confusing term "remote ID" (since what we really mean is
"remotely-allocated local ID" or "locally-allocated remote ID", both of
which mean the same thing but are used in different contexts ... and
both of which are very long phrases).

R=yzshen@chromium.org

Committed: https://crrev.com/9650ad0d17562dd8acd57de719f8af54e81eed8c
Cr-Commit-Position: refs/heads/master@{#299375}

[viettrungluu, 2014-10-13 20:39:34]

(brettw would have more context, but he's buried in a committee at an
undisclosed location.)

[yzshen1, 2014-10-13 21:03:52]

lgtm

[viettrungluu, 2014-10-13 21:06:28]

The CQ bit was checked by viettrungluu@chromium.org

[commit-bot: I haz the power, 2014-10-13 21:07:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/649303002/1

[commit-bot: I haz the power, 2014-10-13 22:04:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-13 22:04:59]

Patchset 1 (id:??) landed as
https://crrev.com/9650ad0d17562dd8acd57de719f8af54e81eed8c
Cr-Commit-Position: refs/heads/master@{#299375}