Fix flakiness in FadeTransitionTest

Bug 38349552

GCE devices are slower than regular devices and waits need to take
the slowness into account. A snapshot showed an orientation after
the test was run, so this CL also locks the orientation during
tests.

Test: ran transition and animation tests on GCE device
Change-Id: Id341b833be2bba1d9e5328adfef373f9d91f8bd5