Fixes for resize thread

- Make sure to draw navigation bar/status bar background before the
main render node. This is to avoid any flickering when entering
resizing mode, so you rather overdraw than underdraw.
- Draw the first frame from the main thread directly to increase
chance that all drawing commands are processing within a single
frame.

Bug: 27864358
Bug: 28003586
Change-Id: I033f57cdbcb2c16ea93134c041095a415d5c25b4