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This allows small raster scales like we see for some directly
composited images to not trip over this particular DCHECK. Since these
raster scales are all chosen by inverting the minimum dimension of the
layer bounds, these minimum values round trip, and the resulting tiles
won't be empty as they are doing a EnclosingContentsRectFromLayerRect
to compute the tiling (and tile) size.

Bug: 1124342
Change-Id: Ifb364e7d569d66903a04f9e4c80d56fc3ef8b9da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398985Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Daniel Libby <dlibby@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#806712}