[Wasm] Use renderer setTimeout behavior instead of requestAnimationFrame in Application::run

[AlexandreK38]

Hi!
I look for advice on how to change the code to be able to choose the renderer behavior, so FPS (using setTimeout) or the current behavior requestAnimationFrame.

In Application-wasm.cpp, the key point is emscripten_set_main_loop(updateFrame, -1, false); in run()
Using -1 is for requestAnimationFrame run loop, and if we set the fps instead it will use the setTimeout behavior instead.
How to change the code? We could use the setAnimationInterval value but we need a way to tell whether we use FPS or -1, any advice/help would be appreciated :)

int Application::run()
{
    initGLContextAttrs();
    // Initialize instance and cocos2d.
    if (!applicationDidFinishLaunching())
    {
        return 1;
    }

    __director = Director::getInstance();

    // Retain glview to avoid glview being released in the while loop
    __director->getGLView()->retain();

    /*
    The JavaScript environment will call that function at a specified number
    of frames per second. If called on the main browser thread, setting 0 or
    a negative value as the fps will use the browser’s requestAnimationFrame mechanism
    o call the main loop function. This is HIGHLY recommended if you are doing rendering,
    as the browser’s requestAnimationFrame will make sure you render at a proper smooth rate
    that lines up properly with the browser and monitor.
    */
    emscripten_set_main_loop(updateFrame, -1, false);

    return 0;
}

void Application::setAnimationInterval(float interval)
{
    s_animationInterval = static_cast<int64_t>(interval * NANOSECONDSPERSECOND);
}

Why changing the behavior? that's the good question, but with requestAnimationFrame if the browser tab lose focus the game doesn't run, whereas with given FPS with setTimeout it runs

[AlexandreK38]

I'll define and use AX_WASM_LOOP_TYPE with fps or default raf