Bug 1167999: Give video documents a dark background color, the average color of the darknoise background image. r=seth

toolkit/themes/osx/global/media/TopLevelVideoDocument.css

@@ -4,6 +4,7 @@
 
 body {
   background-image: url("chrome://global/skin/media/imagedoc-darknoise.png");
+  background-color: rgb(33,33,33); /* Average color of that ^ image. */
 }
 
 video {

toolkit/themes/windows/global/media/TopLevelVideoDocument.css

@@ -4,6 +4,7 @@
 
 body {
   background-image: url("chrome://global/skin/media/imagedoc-darknoise.png");
+  background-color: rgb(33,33,33); /* Average color of that ^ image. */
 }
 
 video {