Rebuild property_tree after LayerImpl::SetTransform() is called in tests
Rebuild property_tree after LayerImpl::SetTransform() is called in tests

This fixes test LayerTreeHostCommonTest.MaximumAnimationScaleFactor

If LayerImpl::SetTransform() is called, we need to rebuild/update the
property_tree.

In practice, LayerImpl::SetTransform() is only called through
LayerImpl::OnTransformAnimated(), where we already do property tree
update.

In test LayerImpl::SetTranform() can be triggered by itself, in
this case, lets just force a property rebuild.

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1179003002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#334050}

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