Set the unique_event_id when converting from TouchEvent to WebTouchEvent

ui/events/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 static_library("dom4_keycode_converter") {
   sources = [
     "keycodes/dom3/dom_code.h",
     "keycodes/dom3/dom_key.h",
     "keycodes/dom3/dom_key_data.h",
     "keycodes/dom4/keycode_converter.cc",
     "keycodes/dom4/keycode_converter.h",
     "keycodes/dom4/keycode_converter_data.h",
   ]
 
   deps = [
     "//base",
   ]
 }
 
 component("events_base") {
   sources = [
     "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/dom_us_layout_data.h",
@@ skipping 324 matching lines @@
 if (is_nacl) {
   source_set("latency_info") {
     sources = [
       "ipc/latency_info_param_traits.cc",
       "ipc/latency_info_param_traits.h",
       "latency_info.cc",
       "latency_info.h",
     ]
   }
 }