[perf-web] Deal with multiple calls to window.onloaded()

[Owen Taylor <otaylor src gnome org>]

commit ac23064bddda6223f5e7cc188f0abafc5f98c191
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Sun Jun 29 13:42:32 2014 -0400

    Deal with multiple calls to window.onloaded()
    
    It seems like the loaded events gets fired multiple times; short-circuit
    this out.

 static/main.js |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/static/main.js b/static/main.js
index b87761e..d56d9c1 100644
--- a/static/main.js
+++ b/static/main.js
@@ -974,6 +974,9 @@ PerfDisplay.prototype.load = function() {
 }
 
 PerfDisplay.prototype.onWindowLoaded = function() {
+    if (this.windowLoaded)
+        return;
+
     this.windowLoaded = true;
 
     $( ".chart" ).each(function() {