Send pointerleave and pointerenter events for styluses on Mac

content/browser/renderer_host/input/web_input_event_builders_mac.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_WEB_INPUT_EVENT_BUILDERS_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_WEB_INPUT_EVENT_BUILDERS_MAC_H_
 
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 @class NSEvent;
 @class NSView;
 
 namespace content {
 
 class CONTENT_EXPORT WebKeyboardEventBuilder {
  public:
   static blink::WebKeyboardEvent Build(NSEvent* event);
 };
 
 class CONTENT_EXPORT WebMouseEventBuilder {
  public:
-  static blink::WebMouseEvent Build(NSEvent* event, NSView* view);
+  static blink::WebMouseEvent Build(
+      NSEvent* event,
+      NSView* view,
+      blink::WebPointerProperties::PointerType pointerType =
+          blink::WebPointerProperties::PointerType::Mouse);
 };
 
 class CONTENT_EXPORT WebMouseWheelEventBuilder {
  public:
   static blink::WebMouseWheelEvent Build(NSEvent* event,
                                          NSView* view);
 };
 
 class CONTENT_EXPORT WebGestureEventBuilder {
  public:
   static blink::WebGestureEvent Build(NSEvent*, NSView*);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_WEB_INPUT_EVENT_BUILDERS_MAC_H_