Fix some unit tests that fail when we enable impl property trees

This patch fixes some unit tests that fail when we set the
default value of 'use_property_trees' to true for
CalcDrawPropsImplInputsForTesting.

BUG=551629
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1416293005

Cr-Commit-Position: refs/heads/master@{#358733}
2 files changed