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There are two dirty bits for whether TransformTree::UpdateLocalTransform
needs to be called: TransformNode::needs_local_transform_update, and
TransformTree::needs_update. If the transform tree does not need an
update, we skip calling TransformTree::UpdateLocalTransform.

This patch DCHECKS that no transform node needs an update if we are
skipping TransformTree::UpdateLocalTransform due to the tree not needing
an update.

Bug: 864567
Change-Id: Ib43ce23d8715c1cf802aaefb8e4068ce24fd07b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1650120
Auto-Submit: Philip Rogers <pdr@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667326}