Add a download button to the media player

third_party/WebKit/LayoutTests/media/overflow-menu.js

 // We expect the items in the overflow to appear in the following ordering.
 var overflowButtonsCSS = [
     "-webkit-media-controls-mute-button",
     "-internal-media-controls-cast-button",
     "-webkit-media-controls-toggle-closed-captions-button",
     "-webkit-media-controls-fullscreen-button",
-    "-webkit-media-controls-play-button"];
+    "-webkit-media-controls-play-button",
+    "-internal-download-button"];
 //  PseudoID for the overflow button
 var menuID = "-internal-overflow-menu-button";
 //  PseudoID for the overflow list
 var listID = "-internal-media-controls-overflow-menu-list";
 
 // Returns the overflow menu button within the given media element
 function getOverflowMenuButton(media) {
   return mediaControlsElement(internals.shadowRoot(media).firstChild, menuID);
 }
 
 // Returns the overflow menu list of overflow controls
 function getOverflowList(media) {
   return mediaControlsElement(internals.shadowRoot(media).firstChild, listID);
 }
 
 // Location of media control element in the overflow button
 var OverflowMenuButtons = {
   MUTE: 0,
   CAST: 1,
   CLOSED_CAPTIONS: 2,
   FULLSCREEN: 3,
   PLAY: 4,
+  DOWNLOAD: 5,
 };
 
 // Default text within the overflow menu
-var overflowMenuText = ["Mute", "Cast", "Captions", "Fullscreen", "Play"];
+var overflowMenuText = ["Mute", "Cast", "Captions", "Fullscreen", "Play", "Download"];