Pause surface position for bounds change transaction

Currently the entering pip bounds is applied at the end of enter
animation. There could be 2 flickering cases:
1. There is an offset from display cutout while the activity is
   fullscreen. The offset should be gone once the task no longer
   overlap with display cutout. But the position change applies
   before the app redraws. Which looks like shift left and then
   right in a short time.
2. Before the window frame is recomputed, the surface position is
   updated with pip bounds, e.g. (0,0)-(200,1000)=(-200,-1000).

So this change updates the window surface position until the app
has reported its draw transaction, and then applies them at once.

Replaced mResizedWhileGone because it was never read for a long time.

Bug: 331315278
Test: Assume the target app support auto-pip and it doesn't draw
      under display cutout.
      E.g. LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
      Enter PiP from 90 degrees to home with 0 degrees.
      The pip content won't shift horizontally a few frames.
Change-Id: I1cd79ccb05ac61edf37dffbbec8cfe37cb85b1f3