LibWeb: Make CanvasImageSource also be an ImageBitmap

Author: https://github.com/LucasChollet
Commit: 94128fe027
Pull-request: https://github.com/SerenityOS/serenity/pull/23850
Reviewed-by: https://github.com/shannonbooth ✅

Userland/Libraries/LibWeb/HTML/ImageBitmap.cpp

@@ -104,4 +104,9 @@ void ImageBitmap::set_bitmap(RefPtr<Gfx::Bitmap> bitmap)
     m_height = m_bitmap->height();
 }
 
+Gfx::Bitmap* ImageBitmap::bitmap() const
+{
+    return m_bitmap.ptr();
+}
+
 }