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This CL adds support for passing PreviewProvider to the WebState
delegate.

Bug: 1140387
Change-Id: I4c4a2665e26875be9d262d884aa96d3cef205af2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587027
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842156}