[cc-slimming] Make TilingSetRasterQueueAll's iterators be optional. TEST=cc_unittests R=vmiura@chromium.org Bug: 335450599 Change-Id: I716fd184de0a82e8158229283dbc003f02e7b0b7 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5773123 Commit-Queue: Victor Miura <vmiura@chromium.org> Reviewed-by: Victor Miura <vmiura@chromium.org> Auto-Submit: Zhenyao Mo <zmo@chromium.org> Cr-Commit-Position: refs/heads/main@{#1339248}
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