device/bluetooth: Add abstract API definition for BluetoothGattDescriptor.

device/bluetooth: Add abstract API definition for BluetoothGattDescriptor.

This CL defines the abstract class BluetoothGattDesciptor, which represents
remote and local GATT characteristic descriptors in the GATT API.

BUG=340525
TEST=Compile Chrome.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=250899

[keybuk, 2014-02-12 00:56:55]

lgtm

[armansito, 2014-02-12 21:26:44]

The CQ bit was checked by armansito@chromium.org

[commit-bot: I haz the power, 2014-02-12 21:27:14]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/armansito@chromium.org/134263008/1

[commit-bot: I haz the power, 2014-02-12 22:57:02]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-02-12 22:57:06]

Retried try job too often on win_rel for step(s) interactive_ui_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[armansito, 2014-02-12 23:12:33]

The CQ bit was checked by armansito@chromium.org

[commit-bot: I haz the power, 2014-02-12 23:19:46]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/armansito@chromium.org/134263008/1

[commit-bot: I haz the power, 2014-02-13 01:35:25]

Change committed as 250899