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When the StocksApp menu is showing, the user shouldn't be able to interact with the rest of the app. Instead, taps outside the menu should dismiss the menu. This CL makes that happen by adding a ModalOverlay on top of the app. We might want to do something fancier in the future using event delegation, but this works for now. R=rafaelw@chromium.org Review URL: https://codereview.chromium.org/1031093002