Merge "servicemanager: guaranteeClient on wait register"

            .allowIsolated = allowIsolated,

            .dumpPriority = dumpPriority,

            .hasClients = prevClients, // see b/279898063, matters if existing callbacks

            .guaranteeClient = false,  // handled below

            .guaranteeClient = false,

            .ctx = ctx,

    };

    if (auto it = mNameToRegistrationCallback.find(name); it != mNameToRegistrationCallback.end()) {

        // TODO: this is only needed once

        // See also getService - handles case where client never gets the service,

        // we want the service to quit.

        // If someone is currently waiting on the service, notify the service that

        // we're waiting and flush it to the service.

        mNameToService[name].guaranteeClient = true;

        CHECK(handleServiceClientCallback(2 /* sm + transaction */, name, false));

        mNameToService[name].guaranteeClient = true;

    mNameToClientCallback[name].push_back(cb);

    // Flush updated info to client callbacks (especially if guaranteeClient

    // and !hasClient, see b/285202885). We may or may not have clients at

    // this point, so ignore the return value.

    (void)handleServiceClientCallback(2 /* sm + transaction */, name, false);

    return Status::ok();

}