Use fullscreen sized buffer for drag resizing

- When drag resizing starts, set the surface size to fullscreen
  (plus any surface insets requested by win attrs), so that we don't
  reallocate buffers and the buffers don't get rejected by surfaceflinger
  due to size-mismatch.

- When drag resizing ends, restore the surface size to the original.

- Update shown frame before setSurfaceBoundariesLocked(), as the top-left
  of the window could change, we need to update the surface position. This
  fixes incorrect window positing during resizing by corners on top/left.

- When doing tap-detection, skip non-freeformed tasks. This fixes the
  bug where clicking near border of a window could dismiss it.

Change-Id: I5dc9fc34ff05685320b8fe5d491b9c066c6726e8