Forward port battery icon options

Squash of following patches from cm-12.1 :

Battery text mode (1/2)

PS2: Make battery level more fit current solution
PS3: Fix displaing battery level inside the icon
PS6: Show battery level in status bar header when charging and percentage
     mode set to inside icon (it's replaced by charging icon)

Change-Id: I537c99827e78c796b4980ec7751e5f9b58a88251
Signed-off-by: kecinzer <kecinzer@gmail.com>

Forward port battery icon options [1/2]

Bring forward the various battery icon options.
Portrait, Landscape, Circle, Text.

Still retains new options for where to display battery percentage text.

Change-Id: Icfc14d989eebde9014538291c24aa76d328df234

Cleanup battery style code

* Cleanup commented out code
* Fix landscape battery icon padding
* Fix landscape battery icon charging indicator
* Fix landscape battery icon percentage indicator
* Fix circle battery frame color on some black backgrounds
* Fix circle battery artifact on low percentage
* Fix percentage not shown while charging
* Fix percentage always showing on expanded status bar
* Fix battery icon showing after reboot on text/hidden modes

Change-Id: Ic56878c26e9a3416149eaaa8a9325d56d664e22e

SystemUI : Make BatteryMeterView multi-user compatible

Change-Id: Ib9a266dc74732b7ad328a6503898a8fbc46af58e

Clean up battery handling.

Use a single observer for all battery meter and level views, and remove
no-longer used callback registrations.

Change-Id: I8f9db5e484628d7fbc74fe892d64bef5f08cea24

SystemUI: Fix blinking when reported battery level is 0

Canvas::drawArc has a bug where, if the sweepAngle is 0,
depending on the startAngle it will draw an empty or full
circle. In the rare cases where the battery reports 0%
this would cause the circular meter to blink furiously
as it animates through several values of startAngle.

As a workaround, let's avoid drawing the percentage bar
if the reported battery level is zero.

Change-Id: I4c1c767f3616c9d2f8a60df63d64ec1f4e266583

SystemUI: improve circle battery

While plugged in, the circle animation would cause the statusbar to
keep redrawing itself repeatedly, using up unnecessary cpu cycles,
even when idle.

- Removed circle animation in status bar
- Left animations on keyguard/notificaiton header
- Set layer type to hardware when animating for optimized quick drawing
- Cleaned up some logic and unnecessary locking
- Removed extra work done in each draw
- override onDraw instead of draw to let the View system decide when we
  should draw

Change-Id: If0624ab6e3723f4522ebbd9ce583b142c1cb4606
Signed-off-by: Roman Birg <roman@cyngn.com>