tweak surface_image_unity on 32-bit bots

The allocations implied by the larger sizes can exhaust the 32-bit
virtual address space, even if we don't touch the bytes to page them in.

Add a 1<<18 test case to make sure we always test something outside
16-bit sizes, even on 32-bit bots.

Bug: skia:7614

Change-Id: I6bae930e89bd969931f478a8896f07451f7af595
Reviewed-on: https://skia-review.googlesource.com/108602
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed