Re: [manifest] manifest should be queried when app is launched from home screen (#292)

Duplicate of: https://github.com/w3c/manifest/issues/272

@laurentperez what you are describing about updates is currently a limitation in Chrome's implementation. The spec contains some text already about [performing updates](http://www.w3.org/2008/webapps/manifest/#updating), but you are correct that it doesn't speak about the identity problem - so will absolutely add something to the spec (will probably reuse some of what you wrote to explain the use case :) ). 

The problems with trying to key an app off the manifest data is that the manifest is allowed to be empty. So, a manifest file with just "" or "{}" is totally valid. 

It's probably better just to key it off the URL of the manifest, as suggested in #272. 
 

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