WEBP_MAX_IMAGE_SIZE can be defined to control this limit.
Set it to 1.5GiB w/--config=asan-fuzzer to avoid OOM with large resolution
images. This limit leaves some headroom over the single image max of 2^14 *
2^14 * 4
BUG=webp:355
Change-Id: I4d48eb0a063638297a842582e0229dfd5a54df5f