add settings to android webview to allow enabling file scheme and thi…

[thurber]

Add two props to android WebView:

• acceptFileSchemeCookies: controls whether or not android WebViews that load file scheme urls are allowed to used cookies
• acceptThirdPartyCookies: controls whether or not android WebViews allow third party cookies

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[hramos]

What issue is this solving? Can you add tests?

[thurber]

I had needed this to be able to view pdfs via an implementation of Mozilla's pdfjs embedded as a file url, when the pdfs required a previously obtained session cookie to access. I've since implemented a workaround, so happy to close out this PR if no one else needs it.

[jacobp100]

There's another PR (#10946) that lets you add behaviour to the existing web view. I think this is quite specific, so I think we should wait and see what happens with said PR.

[lacker]

I think we have too many possible configurable behavior things to add every prop to WebView, so if the approach in 10946 works that is ideal. Let's close this pull request but we can reopen if more general approaches fail.