Devtools UI: Fix tooltip issues

Source/devtools/front_end/emulation/ResponsiveDesignView.js

 // Copyright 2014 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.
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  * @implements {WebInspector.OverridesSupport.PageResizer}
  * @implements {WebInspector.TargetManager.Observer}
  * @param {!WebInspector.InspectedPagePlaceholder} inspectedPagePlaceholder
@@ skipping 43 matching lines @@
 
         this._createToolbar();
 
         this._canvasContainer = new WebInspector.Widget();
         this._canvasContainer.element.classList.add("responsive-design");
         this._canvasContainer.show(this._responsiveDesignContainer.element);
 
         this._canvas = this._canvasContainer.element.createChild("canvas", "fill responsive-design-canvas");
 
         this._mediaInspectorContainer = this._canvasContainer.element.createChild("div", "responsive-design-media-container");
+        WebInspector.Tooltip.addNativeOverrideContainer(this._mediaInspectorContainer);
         this._mediaInspector = new WebInspector.MediaQueryInspector();
         this._updateMediaQueryInspector();
 
         this._warningInfobar = new WebInspector.Infobar(WebInspector.Infobar.Type.Warning, WebInspector.moduleSetting("disableOverridesWarning"));
         this._warningInfobar.element.classList.add("responsive-design-warning");
         this._warningInfobar.setCloseCallback(WebInspector.overridesSupport.clearWarningMessage.bind(WebInspector.overridesSupport));
         this._canvasContainer.element.appendChild(this._warningInfobar.element);
         this._warningMessage = this._warningInfobar.element.createChild("span");
         WebInspector.overridesSupport.addEventListener(WebInspector.OverridesSupport.Events.OverridesWarningUpdated, this._overridesWarningUpdated, this);
 
@@ skipping 779 matching lines @@
 WebInspector.EmulationDispatcher.prototype = {
     /**
      * @override
      * @param {!EmulationAgent.Viewport=} viewport
      */
     viewportChanged: function(viewport)
     {
         this._responsiveDesignView._viewportChanged(viewport);
     }
 }