Manage profiles in BluetoothAdapter on ChromeOS

Manage profiles in BluetoothAdapter on ChromeOS

Profiles in bluez are not specific to a device.
When client code tries to connect to two different devices, only
one profile is created, managed by BluetoothAdapterChromeOS.

dbus messages are multiplexed based on the device desired using new
class BluetoothAdapterProfileChromeOS.

This is a resubmit with bugfixes after https://codereview.chromium.org/851123002/ was reverted by
https://codereview.chromium.org/868753006/

BUG=421207
Committed: https://crrev.com/f3f0784e90e8d4a26b1aa3d57e435a01b44a99a2
Cr-Commit-Position: refs/heads/master@{#314030}

[Marie Janssen, 2015-01-30 18:49:38]

jamuraa@chromium.org changed reviewers:
+ armansito@chromium.org, keybuk@chromium.org

[armansito, 2015-01-30 22:13:06]

lgtm

[Marie Janssen, 2015-01-30 22:13:28]

The CQ bit was checked by jamuraa@chromium.org

[commit-bot: I haz the power, 2015-01-30 22:14:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/888913002/1

[commit-bot: I haz the power, 2015-01-30 23:51:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-30 23:51:53]

Patchset 1 (id:??) landed as
https://crrev.com/f3f0784e90e8d4a26b1aa3d57e435a01b44a99a2
Cr-Commit-Position: refs/heads/master@{#314030}