Bug 951499 - Horizontal audio control needs hidpi graphics. r=jaws

toolkit/themes/osx/global/jar.mn

@@ -175,7 +175,9 @@ toolkit.jar:
   skin/classic/global/media/throbber.png                             (media/throbber.png)
   skin/classic/global/media/stalled.png                              (media/stalled.png)
   skin/classic/global/media/volume-empty.png                         (media/volume-empty.png)
+  skin/classic/global/media/volume-empty@2x.png                      (media/volume-empty@2x.png)
   skin/classic/global/media/volume-full.png                          (media/volume-full.png)
+  skin/classic/global/media/volume-full@2x.png                       (media/volume-full@2x.png)
   skin/classic/global/media/clicktoplay-bgtexture.png                (media/clicktoplay-bgtexture.png)
   skin/classic/global/media/videoClickToPlayButton.svg               (media/videoClickToPlayButton.svg)
   skin/classic/global/menu/menu-arrow.png                            (menu/menu-arrow.png)

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

@@ -320,6 +320,14 @@ html|table {
     background-image: url(chrome://global/skin/media/playButton@2x.png);
     background-size: 28px 28px;
   }
+  .volumeBackground {
+    background-image: url(chrome://global/skin/media/volume-empty@2x.png);
+    background-size: 32px 16px;
+  }
+  .volumeForeground {
+    background-image: url(chrome://global/skin/media/volume-full@2x.png);
+    background-size: 32px 16px;
+  }
   .muteButton {
     background-image: url(chrome://global/skin/media/muteButton@2x.png);
     background-size: 33px 28px;