Real restart in dev mode

Summary: To test plugin installation I need to restart Flipper often, however restart in dev mode is not "true" restart - instead it just reloads the window and doesn't load freshly installed plugins. To make my life easier I have implemented more realistic way for restart in dev mode.

Reviewed By: jknoxville

Differential Revision: D19770263

fbshipit-source-id: 8755663746dc265e0826ed79b9782e073132537f

src/utils/restartFlipper.tsx

@@ -15,10 +15,10 @@ export default function restart() {
     remote.app.relaunch();
     remote.app.exit();
   } else {
-    // Relaunching the process doesn't work in dev mode
-    // because it just launches an empty electron shell.
-    // Instead, approximate it by doing a refresh.
-    // Should be roughly equivalent but there may be some differences.
-    remote.getCurrentWindow().reload();
+    // Relaunching the process with the standard way doesn't work in dev mode.
+    // So instead we're sending a signal to dev server to kill the current instance of electron and launch new.
+    fetch(`${remote.process.env.DEV_SERVER_URL}/_restartElectron`, {
+      method: 'POST',
+    });
   }
 }