SystemUI: allow for the clock to be centered (1 of 2)

This allows the clock to be centered and does
not break the normal functionality of the status bar.
Overflow for status bar icons is adjusted accordingly
when the clock is centered. The clock slides in/out
when centered and the ticker is running.

Change-Id: I8bb99af278d316d7632cd07ff5c4722c5a27cb12
IconPackHelper: Respect the original size of bitmap icons

When use icon packs on low-resolution devices, for example, my HDPI
phone, it seems that using the size returned by
getLauncherLargeIconSize() will cause a blurness on
some icons that are not included in the icon pack because of the compose
function.

This patch respects the original size of the icon if the icon is an
instance of BitmapDrawable but use the size returned by
getLauncherLargeIconSize() if the icon is an instance of PaintDrawable.
This will remove icon blurness on low-resolution devices.

Change-Id: Ifcb39020d934a9c7cb409e1206a179d64f99aa37
Merge "SystemUI: allow for the clock to be centered (1 of 2)" into pac-4.4
Merge "IconPackHelper: Respect the original size of bitmap icons" into pac-4.4