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Overdraw feedback has been broken for two reasons:
1. When we added explicit fences, we inserted the fence before the
  overdraw colors were drawn
2. When we changed how we do partial swap, we forgot to expand the rect
  where the overdraw feedback is drawn to.

This CL fixes those two issues moving the drawing of the overdraw
feedback at the end of DrawRenderPass.

Test: Run Chrome on nocture with the flag to enable overdraw feedback
Change-Id: I57069f8596d0bdb2bc819c8de5c70cf3901d7199
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904681
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714540}