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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/+/2302733Reviewed-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}