Remove some unused and unneeded flags.

benchmarks/spinning-balls/v.js

Index: benchmarks/spinning-balls/v.js
===================================================================
--- benchmarks/spinning-balls/v.js	(revision 9575)
+++ benchmarks/spinning-balls/v.js	(working copy)
@@ -42,6 +42,9 @@
   } )();
 }
 
+
+
+
 var kNPoints = 8000;
 var kNModifications = 20;
 var kNVisiblePoints = 200;
@@ -54,11 +57,23 @@
 var dyingPoints = void 0;
 var scene = void 0;
 var renderingStartTime = void 0;
+var omitFrameDueToVisibilityChange = false;
 var scene = void 0;
 var pausePlot = void 0;
 var splayTree = void 0;
 
+handleVisibilityChange();
 
+function handleVisibilityChange() {
+  console.log("visibility change");
+  omitFrameDueToVisibilityChange = true;
+  document.addEventListener("webkitvisibilitychange", handleVisibilityChange);
+  document.addEventListener("msvisibilitychange", handleVisibilityChange);
+  document.addEventListener("mozvisibilitychange", handleVisibilityChange);
+  document.addEventListener("visibilitychange", handleVisibilityChange);
+}
+
+
 function Point(x, y, z, payload) {
   this.x = x;
   this.y = y;
@@ -353,9 +368,12 @@
   scene.draw();
 
   var renderingEndTime = Date.now();
-  var pause = renderingEndTime - renderingStartTime;
-  pausePlot.addPause(pause);
+  if (!omitFrameDueToVisibilityChange) {
+    var pause = renderingEndTime - renderingStartTime;
+    pausePlot.addPause(pause);
+  }
   renderingStartTime = renderingEndTime;
+  omitFrameDueToVisibilityChange = false;
 
   pausePlot.draw();