Sometimes, we simply want to try a Chrome App before installing it for real since we may forget to uninstall it later. To fix that, the Chromium Team is currently experimenting with "Ephemeral Apps".

By enabling the chrome://flags/#enable-ephemeral-apps flag, you'll notice that searching for Apps from the App Launcher will now return Chrome Webstore results with two buttons "Add" and "Launch" instead of the lonely "Install" button.
The "Launch" button is intended to launch the App without installing it but for now in Dev Channel, this is the same as the "Add" button.
 
Source: https://codereview.chromium.org/35543005
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