handle messages in idleCallback

Summary: When receiving a message from the device, the parsing and updating is now handled in an idleCallback, with a timeout of 500ms.

Reviewed By: passy

Differential Revision: D15469094

fbshipit-source-id: c3fc70c2f082930a1a0a01078732cfd45297c391

src/Client.js

@@ -111,9 +111,10 @@ export default class Client extends EventEmitter {
 
     const client = this;
     this.responder = {
-      fireAndForget: (payload: {data: string}) => {
-        client.onMessage(payload.data);
-      },
+      fireAndForget: (payload: {data: string}) =>
+        requestIdleCallback(() => client.onMessage(payload.data), {
+          timeout: 500,
+        }),
     };
 
     if (conn) {