Set the unique_event_id when converting from TouchEvent to WebTouchEvent

content/browser/renderer_host/input/touch_emulator.cc

 // 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.
 
 #include "content/browser/renderer_host/input/touch_emulator.h"
 
 #include "content/browser/renderer_host/input/motion_event_web.h"
 #include "content/browser/renderer_host/input/web_input_event_util.h"
 #include "content/common/input/web_touch_event_traits.h"
 #include "content/grit/content_resources.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
+#include "ui/events/base_event_utils.h"
 #include "ui/events/blink/blink_event_util.h"
 #include "ui/events/gesture_detection/gesture_provider_config_helper.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/screen.h"
 
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
 using blink::WebKeyboardEvent;
 using blink::WebMouseEvent;
 using blink::WebMouseWheelEvent;
@@ skipping 194 matching lines @@
   if (!native_stream_active_sequence_count_ && !is_sequence_start)
     return true;
 
   if (is_sequence_start)
     native_stream_active_sequence_count_++;
   return false;
 }
 
 void TouchEmulator::HandleEmulatedTouchEvent(blink::WebTouchEvent event) {
   DCHECK(gesture_provider_);
+  event.uniqueTouchEventId = ui::GetNextTouchEventId();
   auto result = gesture_provider_->OnTouchEvent(MotionEventWeb(event));
   if (!result.succeeded)
     return;
 
   const bool event_consumed = true;
   // Block emulated event when emulated native stream is active.
   if (native_stream_active_sequence_count_) {
     gesture_provider_->OnSyncTouchEventAck(event_consumed);
     return;
   }
@@ skipping 204 matching lines @@
   point.screenPosition.x = mouse_event.globalX;
   point.position.y = mouse_event.y;
   point.screenPosition.y = mouse_event.globalY;
 }
 
 bool TouchEmulator::InPinchGestureMode() const {
   return shift_pressed_;
 }
 
 }  // namespace content