Google Play Services Tasks API with Kotlin Coroutines support

Async.kt

suspend fun <T> Task<T>.await(): T {
    if (isComplete) return if (isSuccessful) result else throw exception!!
    return suspendCoroutine { c: Continuation<T> ->
        addOnSuccessListener { c.resume(it) }
        addOnFailureListener { c.resumeWithException(it) }
    }
}

fun <T> Deferred<T>.asTask(): Task<T> {
    val source = TaskCompletionSource<T>()
    invokeOnCompletion {
        try {
            source.setResult(getCompleted())
        } catch (e: Exception) {
            source.setException(e)
        }
    }
    return source.task
}