Small cleanup
HALO: Add HDPI icons for new options.
Fix derp observer

If per app color is disabled, pie gravity ain't work?

Change-Id: Ia1c1cfc23b521863db7993cad2581b38ea011f0a
ThemeUtils: Retain the original package name in themed UI context

In order for themes to reflect on system elements, we're changing
their context, including the package name.

This breaks anything that tries to identify system elements,
most notably any users of the uiautomator. Trying to do
'UiSelector().packageName("android")' to find, for example,
a force-close dialog will fail.

Fixes com.android.cts.uiautomatortest.CtsUiAutomatorTest#testUiWatcher

Change-Id: Ic05c3024b20ac3772ed5597846fbfa4a184ebb0d