SystemUI: Set Status bar opaque during drawer pulldown on tablets only

The status bar only needs to be set as opaque when the notification drawer is pulled down on 600dp and 720dp devices. On phones, this is unnecessary as the top header of the drawer covers the status bar on the phone UI. This change makes a huge difference in reponsiveness on devices that run the phone UI as there is no longer a delay before the drawer appears when interacting with it on an activity with transclucent window decor.
WifiController: fix high perf lock sometimes not respected

When the device screen is turned off, the state is DeviceActive for
15 minutes. In this time, high perf lock is not respected and
Wi-Fi power-saving mode will be turned on because screen is off.

Fix by adding a new DeviceActiveHighPerfState.

Change-Id: I71074beec4d41286dea0861107d7931da205aca2
JIRA: CYAN-2860