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To reduce the number of texture copies in camera and XR scenarios,
we need to be able to share textures between processes using Windows
handle objects.

To facilitate this, we implement the overload of
SharedImageBackingFactoryD3D::CreateSharedImage which accepts a
gfx::GpuMemoryBufferHandle.

Bug: 1131616
Change-Id: I9561229b7631d0a89a7ced4ee6fc0de43c029d45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438649
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812835}