GitLab

The tile priority visible rect is sometimes expected to be not
intersecting the layer bounds. That's expected, since the layer
might be offscreen. In those cases we should still be correctly
prioritizing and creating tiles. This fix addresses that.

BUG=414521
R=danakj

Review URL: https://codereview.chromium.org/577753002

Cr-Commit-Position: refs/heads/master@{#295630}