Add the pointer type of pen to the synthetic WebMousEvent

content/browser/renderer_host/input/synthetic_mouse_driver.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_SYNTHETIC_MOUSE_DRIVER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_MOUSE_DRIVER_H_
 
 #include "base/macros.h"
 #include "content/browser/renderer_host/input/synthetic_pointer_driver.h"
 #include "content/common/content_export.h"
@@ skipping 15 matching lines @@
              SyntheticPointerActionParams::Button button =
                  SyntheticPointerActionParams::Button::LEFT) override;
   void Move(float x, float y, int index = 0) override;
   void Release(int index = 0,
                SyntheticPointerActionParams::Button button =
                    SyntheticPointerActionParams::Button::LEFT) override;
 
   bool UserInputCheck(
       const SyntheticPointerActionParams& params) const override;
 
+ protected:
+  blink::WebMouseEvent mouse_event_;
+
  private:
-  blink::WebMouseEvent mouse_event_;
   unsigned last_modifiers_;
 
   DISALLOW_COPY_AND_ASSIGN(SyntheticMouseDriver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_MOUSE_DRIVER_H_