DefaultContainerService: implement additional methods

For usage in Settings->Storage

Change-Id: I2d45198cc6ea3b84af1547873380eae2c04c0b93
Process the BTN_MOUSE event

This is required in order to make the trackball on devices that has it to
work properly, like it does before ICS. In addition to this patch, you just
need an .idc file that matches the device name for your the trackball. You can
find it by either looking in a kernel log or a logcat.

For example, a device with a Crucial optical navigation pad, will be called
curcial-oj.idc

The .idc file should contain the following:

cursor.mode = navigation
cursor.orientationAware = 1

Place the file in /system/usr/idc folder.

Enable in BoardConfig.mk with BOARD_USE_LEGACY_TRACKPAD := true

Change-Id: I8684b94871a8bf9070dcda3538a239b111da7f5b
GlobalActions: Fix possible race condition when showing dialog.

Depending on the presence of a previous dialog, the newly generated one
gets either immediately displayed (no old dialog) or shortly delayed
(after dismissal of the existing one).
If a new show event happens (by rapid fire of the power key, for instance,
using a keyboard with fast-repeating events) during that delay, a new
dialog will be immediately displayed, and when the delayed show triggers
it'll conflict with it (and bring everything down).

This moves the creation of the new Dialog object to _before_ showing
it (delayed or not), instead of the show method itself, to ensure the
object isn't clobbered by competing/sequential calls to handleShow()

Change-Id: Ie4d9a8507ebaf59da31869c38b98c3c98a74468e
ActionBar: Compute required items prior to optional items

When computing if a item should be shown in the action bar, required items need to be compute prior
to optional ones. Otherwise, in some cases (when the optional menu goes to the left of required
items then the algorithm could determine that optional has space to be shown and force the show of
required items, causing the required items to not be shown).
A concrete case is in the Email app. In the message_view_fragment_option.xml are defined 5 menus,
that when are all shown (xe: in Exchange mailbox account type) the bar is complete filled. But if
the overflow button is forced to be shown (the device has no permanent menu key) the overflow button
overlaps the older button, because space of 'ifRoom' items are wrong computed.

Change-Id: I6fc8e3e202d76f9704d7ec2383c7ee6f7b05ba76