power: Add CPU boosting interface

 * Boosts CPU using Power HAL for the given duration.
 * Duration is given in microseconds.
 * Power HAL must implement POWER_HINT_CPU_BOOST.

Change-Id: Ic79baf7e3d0f75483c2fe8a242b4c3d93368b68b

Conflicts:
	services/jni/com_android_server_power_PowerManagerService.cpp

Change-Id: Ic79baf7e3d0f75483c2fe8a242b4c3d93368b68b

Conflicts:
	core/java/android/os/IPowerManager.aidl
PowerManagerService: Implement setButtonBrightnessOverrideFromWindowManager method

Differs from Android 4.1 (and earlier) implementation in that the
overridden button light still turns off after BUTTON_ON_DURATION instead of
staying on until screen off.  However, button lights are annoying, and
really the purpose of this is to allow apps (e.g., Screen Filter) to
_disable_ the button lights altogether.

Change-Id: If0639dbe01134b72b05fee7f8cd9368dc9a71e4f
Keyboard light: Fix the physical keyboard not light when it's visiable.

Change-Id: I595afd3cb6b422a17ae0f6ec20aa51979db13810
Add PowerManager integration for button and keyboard backlight.
Allows setting button and keyboard backlight brightness as well as
button timeout.
Circle battery style update

Depleted battery arc same width as available battery and 40% opaque white matching system drawables