Set the unique_event_id when converting from TouchEvent to WebTouchEvent

ui/events/events.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 25 matching lines @@
         '../gfx/gfx.gyp:gfx_geometry',
         'dom4_keycode_converter',
       ],
       'defines': [
         'EVENTS_BASE_IMPLEMENTATION',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'android/scroller.cc',
         'android/scroller.h',
+        'base_event_utils.cc',
+        'base_event_utils.h',
         'event_constants.h',
         'event_switches.cc',
         'event_switches.h',
         'events_base_export.h',
         'gesture_curve.h',
         'gesture_event_details.cc',
         'gesture_event_details.h',
         'gestures/fling_curve.cc',
         'gestures/fling_curve.h',
         'keycodes/keyboard_code_conversion.cc',
@@ skipping 396 matching lines @@
               'dependencies': [
                 '../../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }