Fix NTP not to slide with mouse

chrome/browser/resources/shared/js/cr/ui/card_slider.js

Index: chrome/browser/resources/shared/js/cr/ui/card_slider.js
diff --git a/chrome/browser/resources/shared/js/cr/ui/card_slider.js b/chrome/browser/resources/shared/js/cr/ui/card_slider.js
index 1dc4bf6cf47a9df1f4170b76bb75e1278bcf0520..62aca5e384b5ba1b6d3b1292588aa1c49276da21 100644
--- a/chrome/browser/resources/shared/js/cr/ui/card_slider.js
+++ b/chrome/browser/resources/shared/js/cr/ui/card_slider.js
@@ -133,21 +133,22 @@ cr.define('cr.ui', function() {
                                    this.onMouseWheel_.bind(this));
 
       // Also support touch events in case a touch screen happens to be
-      // available.  Note that we could check cr.isTouchOptimized here, but
-      // in general sites should just be listening for touch events without
-      // trying to determine in advance if they may be supported (eg. a touch
-      // screen can always be plugged in after a page has loaded).
-      var TouchHandler = cr.ui.TouchHandler;
-      this.container_.addEventListener(TouchHandler.EventType.TOUCH_START,
-                                       this.onTouchStart_.bind(this));
-      this.container_.addEventListener(TouchHandler.EventType.DRAG_START,
-                                       this.onDragStart_.bind(this));
-      this.container_.addEventListener(TouchHandler.EventType.DRAG_MOVE,
-                                       this.onDragMove_.bind(this));
-      this.container_.addEventListener(TouchHandler.EventType.DRAG_END,
-                                       this.onDragEnd_.bind(this));
-
-      this.touchHandler_.enable(/* opt_capture */ false);
+      // available.  Ideally we would support touch events whenever they
+      // are fired, but for now restrict this extra code to when we know
+      // we want to support touch input.
+      if (cr.isTouchOptimized) {
+        var TouchHandler = cr.ui.TouchHandler;
+        this.container_.addEventListener(TouchHandler.EventType.TOUCH_START,
+                                         this.onTouchStart_.bind(this));
+        this.container_.addEventListener(TouchHandler.EventType.DRAG_START,
+                                         this.onDragStart_.bind(this));
+        this.container_.addEventListener(TouchHandler.EventType.DRAG_MOVE,
+                                         this.onDragMove_.bind(this));
+        this.container_.addEventListener(TouchHandler.EventType.DRAG_END,
+                                         this.onDragEnd_.bind(this));
+
+        this.touchHandler_.enable(/* opt_capture */ false);
+      }
     },
 
     /**