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Prepare for Dawn as an option for compositing and raster by creating an
empty implementation of the DawnContextProvider, which will use the Skia
Dawn backend to create a GrContext.

Compilation of DawnContextProvider and the Skia Dawn backend are enabled
with the gn arg use_skia_dawn=true. The command line flag
--gr-context-type=dawn will select SkiaRenderer Dawn at runtime.

For now it doesn't connect with Dawn, and DawnContextProvider::Create()
always returns nullptr.

See crrev.com/c/1873874 for context.

Bug: 1021566
Change-Id: Ifa8e17e5e8b8b3461f4177956a8e28f5bd8d27c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896120
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713020}