cc: Make LayerTreeHostImplTests specify whether to rebuild property trees.
cc: Make LayerTreeHostImplTests specify whether to rebuild property trees.

RebuildPropertyTrees no longer forces a rebuild of property trees,
it only rebuilds if the caller specifies.

BUG=
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1692573002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#375002}

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