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This reverts commit 4a52a132.

Reason for revert: Crashing the GPU process between pixel_tests, about 40% of the runs. crbug.com/1111312

Original change's description:
> viz: RGBA_TEXTURE copy requests in SkiaRenderer
> 
> Currently, SkiaRenderer does not support RGBA_TEXTURE
> CopyOutputRequests which are used in Chrome OS for screen rotation
> animations [1] (among other things). As part of a larger effort to
> enable SkiaRenderer on Chrome OS, this CL implements RGBA_TEXTURE
> support in SkiaOutputSurfaceImplOnGpu::CopyOutput:
> 
> 1. Refactor SharedImageFactory ownership out of
>    DirectContextProviderDelegateImpl (used only for the
>    use_gl_renderer_copier bypass) and directly into
>    SkiaOutputSurfaceImplOnGpu.
> 2. Create a SharedImage and its Skia representation in CopyOutput and
>    blit the request rect from the source into the output SkSurface.
> 3. Send the SharedImage's mailbox back through the CopyOutputResult
>    with a release callback that destroys the SharedImage.
> 4. Enable SKIA_GL tests in cc_unittests.
> 
> [1] https://source.chromium.org/chromium/chromium/src/+/master:ash/rotator/screen_rotation_animator.cc;l=214;drc=b15cb5fd43aff2d181355401d99e47e2e44aa61f?originalUrl=https:%2F%2Fcs.chromium.org%2F
> 
> Bug: 1046788, 971257, 1098435
> Change-Id: I62d41390828ed0c79a1dc29c508efc748924ce06
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302733
> Reviewed-by: Khushal <khushalsagar@chromium.org>
> Reviewed-by: Jonathan Backer <backer@chromium.org>
> Commit-Queue: Brian Ho <hob@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#792971}

TBR=backer@chromium.org,dcastagna@chromium.org,khushalsagar@chromium.org,hob@chromium.org

Change-Id: I67bc898f661319f387453696cda55076f8b114b6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1046788
Bug: 971257
Bug: 1098435
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2329730Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793144}