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-Normalise the 'region of interest' rectangle to make it usable by the Vision request.
- Retrieve the rect from the Preview Overlay View to ensure it is only being received from view related files and doesn't need the camera connection to be setup.

Bug:1005216

Change-Id: I2d66fe77dee961ee44387bd42aea7df72f1cf48d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810531
Commit-Queue: Tanisha Mandre <tanishamandre@google.com>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698452}