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This ended up being implemented as a toplevel instead of a popup, to handle
things like virtual desktop switching.  I imagine there are some other problems
we might hit, like the window getting decorated, etc.  Although I think the
shape mask might prevent decorations from being visible.  This is not pixel
perfect with Windows, since we're not anti-aliasing the frame border.

Review URL: http://codereview.chromium.org/100203


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14941 0039d316-1c4b-4281-b951-d872f2087c98