PSA: Mac debug bots now do component builds

[Nico Weber]

Hi,

like on windows, the mac main and try waterfall debug builders now do
component builds. Like on windows, the commit queue now sends tryjobs
to 'mac:compile' in addition to 'mac_rel' (ie every changelist landed
by the cq will have successfully compiled with both static and
components build on mac).

If you aren't using the components build yet and don't have a good
reason not to (possible good reason: you work on performance-sensitive
code), now is a great time to give it a try. It'll make your
incremental builds much faster. Just add component=shared_library to
your GYP_DEFINES, rerun `gclient runhooks`, rebuild, done. See
http://www.chromium.org/developers/how-tos/component-build for more
information.

Thanks to the infrastructure team for helping with the bot shuffle.

Nico