Revert "Reland "Exercise the threaded backend in test bots""

This reverts commit 654ca8a340700ca8089abb7828adc2c229c6241e.

Reason for revert: ASAN,MSAN failures

Original change's description:
> Reland "Exercise the threaded backend in test bots"
> 
> This reverts commit ea51393ba918f75c1b40d521081789eeb3b42d6f.
> 
> Reason for revert: try again after many fixes of the threaded backend
> 
> Original change's description:
> > Revert "Exercise the threaded backend in test bots"
> >
> > This reverts commit a39991ebd70f4aaf1290dd516467d729811e45ee.
> >
> > Reason for revert: Random bots timeout
> >
> > Original change's description:
> > > Exercise the threaded backend in test bots
> > >
> > > We can't draw everything correctly now, but it's at least not crashing.
> > >
> > > The draw_to_canvas is modified by adding flush because now the raster
> > > canvas also needs flush like GPU canvases because of the threaded
> > > backend. (Previously, AndroidCodecSrc vetoed GPU (non-raster) sink
> > > and that's why it was not crashing.)
> > >
> > >
> > > Bug: skia:
> > > Change-Id: I222d706c33e15326e1b97d6bef6c46b8c35cebfd
> > > Reviewed-on: https://skia-review.googlesource.com/118886
> > > Reviewed-by: Kevin Lubick <kjlubick@google.com>
> > > Commit-Queue: Yuqian Li <liyuqian@google.com>
> >
> > TBR=kjlubick@google.com,stephana@google.com,liyuqian@google.com
> >
> > Change-Id: Ib1089d937b6e25cc39d90ad4de35b3a4c406f6b1
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: skia:
> > Reviewed-on: https://skia-review.googlesource.com/119100
> > Reviewed-by: Yuqian Li <liyuqian@google.com>
> > Commit-Queue: Yuqian Li <liyuqian@google.com>
> 
> TBR=kjlubick@google.com,stephana@google.com,liyuqian@google.com
> 
> # Not skipping CQ checks because original CL landed > 1 day ago.
> 
> Bug: skia:7838
> Change-Id: I1405212204bf694b2f31dfc38154759e1d3e363f
> Reviewed-on: https://skia-review.googlesource.com/121680
> Commit-Queue: Yuqian Li <liyuqian@google.com>
> Reviewed-by: Yuqian Li <liyuqian@google.com>

TBR=kjlubick@google.com,stephana@google.com,liyuqian@google.com

Change-Id: Id1b273e22a1d0cbc15a2155252909f576b401fa4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:7838
Reviewed-on: https://skia-review.googlesource.com/123360
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
16 files changed