BaseStatusBar: Dismiss heads up on backpress.

Change-Id: I5b6191657cf0b74d825eb653a6e82c33e0527aad
SystemUI: add left and right virtual buttons while typing

Change-Id: Iea446443d33ff305765e47c86523b619676116ac
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

Change-Id: Ia11c614ff4a24c2eee37a16a4a46c44b5b1c2a03