[Android WebView] Add a compatibility quirk for returning screen sizes in physical pixels

This enables the browser to return screen.width / availWidth (and height),
@media device-width (and height), window.outerWidth (and height),
but not window.innerWidth (and height) in physical rather than CSS
pixels.

BUG=305236

Review URL: https://codereview.chromium.org/26373006

git-svn-id: svn://svn.chromium.org/blink/trunk@159299 bbb929c8-8fbe-4397-9dbb-9b2b20218538