Fix Drawable, PopupWindow CTS breakages

Makes ScaleDrawableTest more like ClipDrawableTest, since they have the
same base class. This fixes the state change test, which was incorrect.

Fixes the ClipDrawableTest's opacity check to correctly reflect level.

Uses the correct default values and root view for PopupWindow layout

Bug: 21406104
Bug: 20563211
Change-Id: I2301f3fb71bb53a8df5a704d0d7255da4f6cd20c
3 files changed