Use correct API for screenshotting

This is required to read back hardware bitmaps.

Fixes: 179511592
Test: Updated the relevant test. Removed the transport test, since it
  couldn't work with the current fake-android setup in transport, and
  since it's on the way out anyway.
Change-Id: Ie37630e1ce317e54463d4d44e55089288326d61a
11 files changed