Winscope: keep backwards compatibility prior to windowFrames

We should still be able to properly render traces taken prior to the WindowFrames
refactor - if the property is not available, use the legacy property instead.

Test: yarn run dev
Merged-In: Ie10f7d14ac5673e8be844d2d5a4fa752d502b9df
Change-Id: Ie10f7d14ac5673e8be844d2d5a4fa752d502b9df
1 file changed