Update Android Performance for opening trace.html

docs/AndroidUIPerformance.md

@@ -45,6 +45,16 @@ After opening the trace in your browser (preferably Chrome), you should see some
 
 ![Example](img/SystraceExample.png)
 
+If your trace .html file isn't opening correctly, check your browser console for the following:
+
+![ObjectObserveError](img/ObjectObserveError.png)
+
+Since Object.observe was deprecated in recent browsers, you may have to open the file from the Google Chrome Tracing tool. You can do so by:
+
+- Opening tab in chrome chrome://tracing
+- Selecting load
+- Selecting the html file generated from the previous command.
+
 **HINT**: Use the WASD keys to strafe and zoom
 
 ### Enable VSync highlighting