private void onStartAnimation() {
        mReactContext.getJSModule(RCTEventEmitter.class).receiveEvent(
                mParentComponent.getId(),
                ViroEvents.ON_ANIMATION_START,
                null);
    }
This method should be called when an animation starts and notifies the JS bridge
android/viro_bridge/src/main/java/com/viromedia/bridge/component/VRTManagedAnimation.java