No longer block the main thread on rendering

This change removes the use of setWaitForPresent(true)
on the FrameRenderRequest. This allows the method to return
as soon as the request is synced to the RenderThread and
no longer block while the frame is drawn.

Depends on ag/15411889

Bug: 194927650
Test: manual, capture long screenshot
Change-Id: I93795f3aad52067e52d3614982fd871de4f3432e