ntp4: app install improvements

chrome/browser/resources/ntp4/nav_dot.js

 // Copyright (c) 2011 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.
 
 /**
  * @fileoverview Nav dot
  * This is the class for the navigation controls that appear along the bottom
  * of the NTP.
  */
 
@@ skipping 54 matching lines @@
       if (animate) {
         this.classList.add('small');
         var self = this;
         window.setTimeout(function() {
           self.classList.remove('small');
         }, 0);
       }
     },
 
     /**
+     * Gets the associated TilePage.
+     * @return {TilePage}
+     */
+    get page() {
+      return this.page_;
+    },
+
+    /**
      * Removes the dot from the page after transitioning to 0 width.
      */
     animateRemove: function() {
       this.classList.add('small');
     },
 
     /**
      * Navigates the card slider to the page for this dot.
      */
     switchToPage: function() {
@@ skipping 92 matching lines @@
      * indicator and prevent default handling so the <input> won't act as a drag
      * target.
      * @param {Event} e The MouseOver event for the drag.
      * @private
      */
     doDragOver: function(e) {
       e.preventDefault();
 
       if (!this.dragWrapper_.isCurrentDragTarget)
         e.dataTransfer.dropEffect = 'none';
-      else if (ntp4.getCurrentlyDraggingTile())
-        e.dataTransfer.dropEffect = 'move';
       else
-        e.dataTransfer.dropEffect = 'copy';
+        this.page_.setDropEffect(e.dataTransfer);
     },
 
     /**
      * A dragged element has been dropped on the navigation dot. Tell the page
      * to append it.
      * @param {Event} e The MouseOver event for the drag.
      * @private
      */
     doDrop: function(e) {
       e.stopPropagation();
@@ skipping 33 matching lines @@
     onTransitionEnd_: function(e) {
       if (e.propertyName === 'max-width' && this.classList.contains('small'))
         this.parentNode.removeChild(this);
     },
   };
 
   return {
     NavDot: NavDot,
   };
 });