webextension: handler for runtime messages now returns a promise #413
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Fixes #387
Handling of runtime messages involves asynchronous operations (e.g. injection of stylesheets in frames) which are currently not tied to the return value of the handler. This causes two issues:
console.erroris shown).This PR changes the behavior so that handling of runtime messages returns a promise which can fail. Moreover, different cases of failure now trigger custom error messages so that caller knows why errors are thrown.