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This patch ensures that when we consider whether or not to create
pending tree tiles, we always do so if the LCD state or the raster
transform change. This is required since if any of those change, then
we remove the whole active tree tiling before activating the pending
one. This means that if the pending tree tiling does not have the
tile (because it thought the active tree one would remain), we
can encounter flickering due to missing tiles.

R=wangxianzhu@chromium.org

Bug: 1127803
Change-Id: I45ad2c591de7c215f73f7081ad2e2e5be9d68925
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2411492Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807016}