Do not accept NaN as scrim values

Scrim values are becoming NaN and causing the status bar window
to not collapse.
These are inavlid values and should not be accepted.

Bug: 150672579
Test: make
Change-Id: I8217a0fa9a08f94b98121d6584fafab1bca88b4d
Merged-In: I8217a0fa9a08f94b98121d6584fafab1bca88b4d
2 files changed