Fix NTP not to slide with mouse

chrome/browser/resources/shared/js/cr/ui/touch_handler.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 Touch Handler. Class that handles all touch events and
  * uses them to interpret higher level gestures and behaviors. TouchEvent is a
  * built in mobile safari type:
  * http://developer.apple.com/safari/library/documentation/UserExperience/Reference/TouchEventClassReference/TouchEvent/TouchEvent.html.
  * This class is intended to work with all webkit browsers, tested on Chrome and
@@ skipping 317 matching lines @@
      * If defined and true, the next click event should be swallowed
      * @type {boolean|undefined}
      * @private
      */
     swallowNextClick_: undefined,
 
     /**
      * Start listenting for events.
      * @param {boolean=} opt_capture True if the TouchHandler should listen to
      *      during the capture phase.
+     * @param {boolean=} opt_mouse True if the TouchHandler should generate
+     *      events for mouse input (in addition to touch input).
      */
-    enable: function(opt_capture) {
+    enable: function(opt_capture, opt_mouse) {
       var capture = !!opt_capture;
 
       // Just listen to start events for now. When a touch is occuring we'll
       // want to be subscribed to move and end events on the document, but we
       // don't want to incur the cost of lots of no-op handlers on the document.
       this.events_.add(this.element_, 'touchstart', this.onStart_.bind(this),
                        capture);
-      this.events_.add(this.element_, 'mousedown',
-                       this.mouseToTouchCallback_(this.onStart_.bind(this)),
-                       capture);
+      if (opt_mouse) {
+        this.events_.add(this.element_, 'mousedown',
+                         this.mouseToTouchCallback_(this.onStart_.bind(this)),
+                         capture);
+      }
 
       // If the element is long-pressed, we may need to swallow a click
       this.events_.add(this.element_, 'click', this.onClick_.bind(this), true);
     },
 
     /**
      * Stop listening to all events.
      */
     disable: function() {
       this.stopTouching_();
@@ skipping 483 matching lines @@
 
       this.element_.dispatchEvent(event);
       return event.enableDrag;
     }
   };
 
   return {
     TouchHandler: TouchHandler
   };
 });