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This also adds PropertyConverter::GetPropertyValueFromTransformValue()
which I need in ash for values used in creation of the window but
don't make their way into real properties.

BUG=664625
TEST=none
R=msw@chromium.org

Review-Url: https://codereview.chromium.org/2538633002
Cr-Commit-Position: refs/heads/master@{#435026}