TV Manager API spec: http://seanyhlin.github.io/TV-Manager-API/index.html Current Design: When calling |startScanning|, we get a promise which will get resolved with no value after the triggering operation is succeeded. And then listen to |TVScanningStateChangedEvent| for 4 kinds for states ("cleared", "scanned", "completed", "stopped"). Ehsan's proposal: It'd be better to let the promise returned from |startScanning| cover not only the triggering operation but also the whole channel scanning period. So the promise could be resolved with a value representing "completed" or "stopped" once the whole scanning operation is done. Then we only need 2 states ("cleared", "scanned") for |TVScanningStateChangedEvent|.

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