Use hardware bitmap for shared element snapshots.

Bug: 64851247

Drawing to software bitmaps does not support many
features, most especially hardware bitmaps. This
changes the implementation to using hardware bitmaps
for View snapshots.

Also fixed broken TransitionTest discovered while
testing.

Test: I4ede02db67e578ea4a25069b683f1989c611e06c
Change-Id: I185bbfe1f789055c9efdba5297a74e481607afaf