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This reverts commit 0b7197a2.

Reason for revert: Speculative revert for https://crbug.com/1145587

Original change's description:
> [gpu] Add trace events and thread priority assertion in GpuChannelHost.
>
> Traces collected through Slow Reports show that acquiring the
> GpuChannelHost lock from threads running at different priorities can
> cause priority inversions. In particular, it can cause jank on the
> renderer main thread through this chain of dependency:
>
> > Main thread: cc::ProxyMain::BeginMainFrame
>   > Compositor Thread: TileManager::FlushAndIssueSignals
>     > CompositorTileWorkerBackground (slow):
>         OneCopyRasterBuffer::Playback
>
> This CL adds trace events to make contention on the GpuChannelHost lock
> more obvious in traces, and an assertion to ensure that the
> GpuChannelHost lock is never acquired at background thread priority.
>
> Bug: 1072756
> Change-Id: I2a25efe2e3f6e9bf5d980ca351a990f9c7d256b4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2157659
> Commit-Queue: François Doray <fdoray@chromium.org>
> Reviewed-by: Victor Miura <vmiura@chromium.org>
> Auto-Submit: François Doray <fdoray@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#823744}

TBR=fdoray@chromium.org,vmiura@chromium.org

Change-Id: I18717e6387e20e892b2a58e1aad34cd8b5e4d3e9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1072756, 1145587
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519397Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824017}