Update ANGLE Developer Options

Update ANGLE developer options to allow selecting the OpenGL driver
(default, ANGLE, native) for each app as well as forcing ANGLE for all
apps.

Bug: 118384925
Test: Verify the default/ANGLE/native values are saved and applied and
used by the loader.

Change-Id: I189889b9b780eabe812298c0dd02838f70f97a03
7 files changed