Fix app bug related to same input/output bitmap.

Due to our new bitmap storage optimization, we can't reuse the same
bitmap as input and output safely (since we modify the output directly).
This change updates ImageProcessing to appropriately create a distinct
output Bitmap Allocation and actually use it.

Change-Id: Iecf6c2d203bd1c370b8d0a9fb7e69b419d2eb69b