2D Pie Chart in Data Usage Details.

PieChartView extracted to framework/base (Also used by Dialer app)

Change-Id: Ib080fca1266a4e9e1afc7efd4e904176930959dc

Conflicts:
	src/com/android/settings/widget/PieChartView.java
Live Volume Steps [2/2]

Change-Id: Ibe9cf2772890c1fbef55ab6cc78059a39c514d7d

Conflicts:
	res/values/custom_arrays.xml
	res/values/custom_strings.xml
	res/xml/sound_settings.xml
	src/com/android/settings/SoundSettings.java