Set the unique_event_id when converting from TouchEvent to WebTouchEvent

content/browser/renderer_host/input/web_input_event_util.cc

 // 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.
 
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 
 #include "content/browser/renderer_host/input/web_input_event_util.h"
 
 #include <cmath>
@@ skipping 257 matching lines @@
 
   blink::WebTouchEvent result;
 
   WebTouchEventTraits::ResetType(
       ToWebInputEventType(event.GetAction()),
       (event.GetEventTime() - base::TimeTicks()).InSecondsF(),
       &result);
   result.causesScrollingIfUncanceled = may_cause_scrolling;
 
   result.modifiers = EventFlagsToWebEventModifiers(event.GetFlags());
+  result.uniqueTouchEventId = event.GetUniqueId();
   result.touchesLength =
       std::min(event.GetPointerCount(),
                static_cast<size_t>(WebTouchEvent::touchesLengthCap));
   DCHECK_GT(result.touchesLength, 0U);
 
   for (size_t i = 0; i < result.touchesLength; ++i)
     result.touches[i] = CreateWebTouchPoint(event, i);
 
   return result;
 }
@@ skipping 169 matching lines @@
     flags |= ui::EF_CAPS_LOCK_DOWN;
   if (modifiers & blink::WebInputEvent::IsAutoRepeat)
     flags |= ui::EF_IS_REPEAT;
   if (modifiers & blink::WebInputEvent::IsKeyPad)
     flags |= ui::EF_NUMPAD_KEY;
 
   return flags;
 }
 
 }  // namespace content