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During compilation of assets catalogs, actool has the option of
recompressing the images (likely with pngcrush as used by older
version of Xcode). Add an option to wrapper script to control
whether this is enabled and disable it on iOS (as images have
already been optimised with imageoptim).

Bug: 738359
Change-Id: I8a2b855798bf5f2d221fe9dc1098f8649f77e5a4
Reviewed-on: https://chromium-review.googlesource.com/561777Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485208}