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For an image that's already optimized, aapt crunch typically increases
the image size. In this case, we now use the original image instead of
the crunched image. 9-patches, however, must always be crunched, since
crunching adds important metadata to the file.

Currently, this saves 50KB, but has the potential to save up to 300KB
once we optimize all the images in the codebase.

BUG=407781

Review URL: https://codereview.chromium.org/867483005

Cr-Commit-Position: refs/heads/master@{#313656}