Fix TAP_DOWN gesture event:

content/browser/renderer_host/web_input_event_aurax11.cc

 // Copyright (c) 2012 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.
 
 // Portions based heavily on:
 // third_party/WebKit/Source/WebKit/chromium/public/gtk/WebInputEventFactory.cpp
 //
 /*
  * Copyright (C) 2006-2011 Google Inc. All rights reserved.
  *
@@ skipping 350 matching lines @@
       break;
     case ui::ET_SCROLL_FLING_CANCEL:
       gesture_event.type = WebKit::WebInputEvent::GestureFlingCancel;
       break;
     case ui::ET_GESTURE_LONG_PRESS:
       gesture_event.type = WebKit::WebInputEvent::GestureLongPress;
       break;
     case ui::ET_GESTURE_TWO_FINGER_TAP:
       gesture_event.type = WebKit::WebInputEvent::GestureTwoFingerTap;
       break;
-    case ui::ET_GESTURE_TAP_UP:
+    case ui::ET_GESTURE_BEGIN:
+    case ui::ET_GESTURE_END:
     case ui::ET_GESTURE_MULTIFINGER_SWIPE:
       break;
     default:
       NOTREACHED() << "Unknown gesture type: " << event->type();
   }
 
   gesture_event.deltaX = event->delta_x();
   gesture_event.deltaY = event->delta_y();
   gesture_event.modifiers = EventFlagsToWebEventModifiers(event->flags());
 
@@ skipping 65 matching lines @@
 
   // Update the type of the touch event.
   web_event->type = TouchEventTypeFromEvent(event);
   web_event->timeStampSeconds = event->time_stamp().InSecondsF();
   web_event->modifiers = EventFlagsToWebEventModifiers(event->flags());
 
   return point;
 }
 
 }  // namespace content