DevTools: Create 2D slider for shadow-editor offset

third_party/WebKit/Source/devtools/front_end/platform/DOMExtension.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 914 matching lines @@
  */
 Document.prototype.deepElementFromPoint = function(x, y)
 {
     var node = this.elementFromPoint(x, y);
     while (node && node.shadowRoot)
         node = node.shadowRoot.elementFromPoint(x, y);
     return node;
 }
 
 /**
+ * @return {?Element}
+ */
+Document.prototype.deepActiveElement = function()
+{
+    var activeElement = this.activeElement;
+    while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)
+        activeElement = activeElement.shadowRoot.activeElement;
+    return activeElement;
+}
+
+/**
  * @param {!Event} event
  * @return {boolean}
  */
 function isEnterKey(event)
 {
     // Check if in IME.
     return event.keyCode !== 229 && event.key === "Enter";
 }
 
 /**
@@ skipping 23 matching lines @@
     {
         window.removeEventListener("DOMContentLoaded", windowLoaded, false);
         callback();
     }
 
     if (document.readyState === "complete" || document.readyState === "interactive")
         callback();
     else
         window.addEventListener("DOMContentLoaded", windowLoaded, false);
 }