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Chrome supports a non-standard "priority" option for cookies, which is
used to prioritize eviction when the cookie jar is full. Since the
document.cookie setter just passes the cookie string through IPC to
RenderFrameMessageFilter::SetCookie and, after various hops, into the
net::CookieStore, the option is implicitly supported even though it was
intended primarily for use by the Set-Cookie HTTP header.

Add test coverage so we don't unintentionally regress support for
this if, for example, we change the way document.cookie passes
cookies into net::CookieStore.

Change-Id: I0084d2f177ca7dac88a3f20603198c689351c4a2
Reviewed-on: https://chromium-review.googlesource.com/1116059Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570874}