Fix stale background blur drawable in DecorView
The BackgroundBlurDrawable is linked to a specific ViewRootImpl. When the view is detached and re-attached, the ViewRootImpl changes, so we need to reinitialize the background blur drawable inside DecorView. This CL properly handles onDetachedFromWindow in DecorView. Bug: 177523043 Test: m && atest BlurAggregatorTest Change-Id: I2e25a2f85bdf95c151fd01dc794a6bc4b16c03b1
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