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→Differences between "data sources" and activities/intents
However due to various complexities we found that "data sources" tend to be different enough from other WebActivity use cases that we'll likely need significantly different primitives. Though there might be possible to tie in with WebActivities somehow.
When granting access to for example contacts to an app, you likely want that app to have access to *''all* '' your contacts, not just the contacts from a specific other app. So you'd want to grant access to your gmail contacts, your facebook friends, your outlook address book and any "built in" contact address book.
Getting contacts from many apps at the same time can be prohibitively expensive if you have to launch all those apps, even if they don't need to render UI. Each app runs in a separate process and starting multiple processes takes a lot of CPU and memory on mobile.
