Bug 1275461 - Part 2: See if slowing down the color changes helps. r=drno

MozReview-Commit-ID: HuYKmnXMl4T

--HG--
extra : rebase_source : 98a87572ac9cc07aa51102a9faf4058a9521e199

dom/media/tests/mochitest/head.js

@@ -903,7 +903,7 @@ VideoStreamHelper.prototype = {
         // ignore; stream might have shut down, and we don't bother clearing
         // the setInterval.
       }
-    }, 100);
+    }, 500);
   },
 
   waitForFrames: function(canvas, timeout_value) {