Merge "Don't create CE Layer when EffectLayer has nothing to draw." into tm-dev

}

sp<compositionengine::LayerFE> EffectLayer::getCompositionEngineLayerFE() const {

    // There's no need to get a CE Layer if the EffectLayer isn't going to draw anything. In that

    // case, it acts more like a ContainerLayer so returning a null CE Layer makes more sense

    if (hasSomethingToDraw()) {

        return asLayerFE();

    } else {

        return nullptr;

    }

}

compositionengine::LayerFECompositionState* EffectLayer::editCompositionState() {