Use platform WindowMetrics to get window bounds

Getting current insets is a long operation. This is why platform
WindowMetricsController provides WindowMetrics with insetsProvider
instead of resolving those inplace.

AndroidX WindowMetricsCalculator resolves those insets when translates
platform WindowMetrics to their androidX counterpart, which causes a
framedrop.

This change swaps androidX implementation with native one because we
only need screen bounds to determine its size.

Flag: EXEMPT bugfix
Fixes: 363545395
Test: atest VolumePanelScreenshotTest
Test: manual on foldable
Change-Id: Ie1bd7a666097be6714b3a8a0134302e4d59ba58c