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This is a reland of d60e79d1

The problem was that resources were never returned because
ScopedBatchReturnResources was in outer scope than ScopedAllowGpuAccess
so the state when we don't batch already, but still have access to gpu
thread didn't exist.

Solution to merge ScopedBatchReturnResources and ScopedAllowGpuAccess
to make sure everything happens in right order.

Original change's description:
> Limit access to gpu thread in DisplayResourceProvider
>
> This CL makes sure that DisplayResourceProvider return resources only
> when GPU Thread is available to make sure ReleaseImageContexts will
> complete in finite time.
>
> This doesn't change anything for Chrome where GPU Thread is always
> available, but on webview RenderThread that used for gpu access during
> composition is available only during specific times (init, dtor,
> DrawAndSwap)
>
> Bug: 1068716
>
> Change-Id: I8fa482ab7399d6ce7639c1d76187be86ce152059
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138551
> Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
> Reviewed-by: Jonathan Backer <backer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#757967}

Bug: 1068716
Change-Id: Idf531b9ee9e10057b571725a256d2af09efbea69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149377Reviewed-by: Jonathan Backer <backer@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759672}