Add id properties to PointerEvent

ui/events/blink/web_input_event.cc

 // Copyright 2016 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 "ui/events/blink/web_input_event.h"
 
 #include "ui/events/base_event_utils.h"
 #include "ui/events/blink/blink_event_util.h"
 #include "ui/events/blink/blink_features.h"
 #include "ui/events/event.h"
@@ skipping 411 matching lines @@
     webkit_event.button = blink::WebMouseEvent::Button::Middle;
   if (button_flags & EF_RIGHT_MOUSE_BUTTON)
     webkit_event.button = blink::WebMouseEvent::Button::Right;
 
   webkit_event.clickCount = click_count;
   webkit_event.tiltX = roundf(event.pointer_details().tilt_x);
   webkit_event.tiltY = roundf(event.pointer_details().tilt_y);
   webkit_event.force = event.pointer_details().force;
   webkit_event.tangentialPressure = event.pointer_details().tangential_pressure;
   webkit_event.twist = event.pointer_details().twist;
+  webkit_event.id = event.pointer_details().id;
   webkit_event.pointerType =
       EventPointerTypeToWebPointerType(event.pointer_details().pointer_type);
 
   return webkit_event;
 }
 
 blink::WebMouseWheelEvent MakeWebMouseWheelEventFromUiEvent(
     const MouseWheelEvent& event) {
   blink::WebMouseWheelEvent webkit_event(
       blink::WebInputEvent::MouseWheel,
@@ skipping 11 matching lines @@
   webkit_event.tiltX = roundf(event.pointer_details().tilt_x);
   webkit_event.tiltY = roundf(event.pointer_details().tilt_y);
   webkit_event.force = event.pointer_details().force;
   webkit_event.pointerType =
       EventPointerTypeToWebPointerType(event.pointer_details().pointer_type);
 
   return webkit_event;
 }
 
 }  // namespace ui