DevTools: introduce external service client (behind experiment).

third_party/WebKit/Source/devtools/front_end/ui/Widget.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 135 matching lines @@
 
     _processWasShown: function()
     {
         if (this._inNotification())
             return;
         this.restoreScrollPositions();
         this._notify(this.wasShown);
         this._callOnVisibleChildren(this._processWasShown);
     },
 
+    _processWasDetachedFromHierarchy: function()
+    {
+        this._notify(this.wasDetachedFromHierarchy);
+        var copy = this._children.slice();
+        for (var widget of copy)
+            widget._processWasDetachedFromHierarchy();
+    },
+
     _processWillHide: function()
     {
         if (this._inNotification())
             return;
         this.storeScrollPositions();
 
         this._callOnVisibleChildren(this._processWillHide);
         this._notify(this.willHide);
         this._isShowing = false;
     },
@@ skipping 27 matching lines @@
     },
 
     wasShown: function()
     {
     },
 
     willHide: function()
     {
     },
 
+    wasDetachedFromHierarchy: function()
+    {
+    },
+
     onResize: function()
     {
     },
 
     onLayout: function()
     {
     },
 
     /**
      * @param {!Element} parentElement
@@ skipping 118 matching lines @@
         // Update widget hierarchy.
         if (this._parentWidget) {
             var childIndex = this._parentWidget._children.indexOf(this);
             WebInspector.Widget.__assert(childIndex >= 0, "Attempt to remove non-child widget");
             this._parentWidget._children.splice(childIndex, 1);
             if (this._parentWidget._defaultFocusedChild === this)
                 this._parentWidget._defaultFocusedChild = null;
             this._parentWidget.childWasDetached(this);
             var parent = this._parentWidget;
             this._parentWidget = null;
+            this._processWasDetachedFromHierarchy();
         } else {
             WebInspector.Widget.__assert(this._isRoot, "Removing non-root widget from DOM");
         }
     },
 
     detachChildWidgets: function()
     {
         var children = this._children.slice();
         for (var i = 0; i < children.length; ++i)
             children[i].detach();
@@ skipping 416 matching lines @@
 {
     WebInspector.Widget.__assert(!child.__widgetCounter && !child.__widget, "Attempt to remove element containing widget via regular DOM operation");
     return WebInspector.Widget._originalRemoveChild.call(this, child);
 }
 
 Element.prototype.removeChildren = function()
 {
     WebInspector.Widget.__assert(!this.__widgetCounter, "Attempt to remove element containing widget via regular DOM operation");
     WebInspector.Widget._originalRemoveChildren.call(this);
 }