Re: [w3c/manifest] Allowing only site-triggered install prompt (#627)

I propose a standard solution to the problem.
There should be three conditions and if any one of them are met, an app should be able to trigger install prompt. 

1. 30s limit should be imposed when there is no interaction with the app.

2. If a user has clicked/touch the app twice on a given page.

3. If a user has already added website to bookmarks. 

In addition to this, the app must not be installed on the homepage already. 

In our case, like an android or ios app, we need to be able to let the user install our app from the landing page. If we have a native app we can directly take them there. The web should have equal requirements or similar requirements. 

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