Removed old media-internals page and rewrote it.

content/browser/resources/media/new/hover.js

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * A function-object for displaying a tooltip.
+ * usage:
+ *
+ * hover("hi there!");
+ * hover.set(100,250);
+ * hover.stop();
+ */
+var hover = (function () {
+  "use strict";
+
+  // Make a div to hold our tooltip.
+  // There will only be one globally, so we can close over
+  // a single one.
+  var hoverElement = document.createElement('div');
+  document.querySelector('body').appendChild(hoverElement);
+
+  // The visible style is what we will see when the hover is applied.
+  var visibleStyle = "position:absolute; display: block; padding:10px; " +
+    "border: 1px solid black; background: white; " +
+    "padding-top: 3px; padding-bottom: 3px;";
+
+// Set the text for the tooltip
+  var hover = function (text) {
+    hoverElement.setAttribute('style', visibleStyle);
+    removeChildren(hoverElement);
+    hoverElement.appendChild(document.createTextNode(text));
+  };
+
+// Make the tooltip disapear
+  hover.stop = function () {
+    hoverElement.setAttribute('style', "display:none;");
+  };
+
+// Set the position of the tooltip
+  hover.set = function (x, y) {
+    x += 15;
+    y -= 20;
+    hoverElement.setAttribute('style', visibleStyle +
+      " left: " + x + "px; top: " + y + ";");
+  };
+
+  return hover;
+}());