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Allows embedders to specify a virtual resolution used when rendering
web content. Web content will be laid out differently, either
supersampled or subsampled depending on whether the overridden
resolution is smaller or larger relative to the View's native
resolution.

The virtual resolution is then scaled to fit the View.

The GPU surface resolution will remain unaffected; it is the same as
the View's native resolution.

Bug: b/144361044,b/144725868
Change-Id: Iefaa0059235319420dc1e050d33d706c1d96ab18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1977001
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738457}