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If a layer is being hidden (no longer part of the
RenderSurfaceLayerList), then we will not UpdateTiles to add tilings to
it. If scales change on the active tree, the recycle tree will lose
its tilings, then the hidden layer will have 0 tilings on the pending
tree.

In this case, instead of keeping the non-ideal tilings on the active
tree, and having no high-res tiling, drop the non-ideal tilings from
the active tree.

R=enne, vmpstr
BUG=446751

Review URL: https://codereview.chromium.org/924213002

Cr-Commit-Position: refs/heads/master@{#316368}