Handle general display size change for screen decorations

The display size change can happen not only from display mode change,
such as IWindowManager#setForcedDisplaySize can override the display
size without changing display mode.

Because the natural(logical) display size also reflects the size change
by display mode, it can handle both resizing cases.

Bug: 288726181
Test: Switch screen size by "Settings > Display > Screen resolution"
      or "adb shell wm size 1440x3120" & "adb shell wm size reset".
      The cutout won't be flickering.

Change-Id: Ibf50f74bd070705297fdb3e3b1e8846a1ea42c19