Macro trace_msg_from_embedder 

macro_rules! trace_msg_from_embedder {
    ($event:expr, $($rest:tt)+) => { ... };
}

Log an event from embedder at trace level.

• To disable tracing: RUST_LOG=‘constellation<embedder@=off’
• To enable tracing: RUST_LOG=‘constellation<embedder@’
• Recommended filters when tracing is enabled:
  • constellation<embedder@ForwardEvent(MouseMoveEvent)=off
  • constellation<embedder@LogEntry=off
  • constellation<embedder@ReadyToPresent=off