Enable lazy evaluation for getWindowInsets()

To reduce unnecessary cost when getting bounds.
See I28230adcdf004eed60a9fcd4481639f5c04b7c2c

Bug: 151908239
Test: atest android.view.WindowMetricsTest
Change-Id: If619aad648b01fef19b9973459c4b621f5eeb4a3
1 file changed