Add the pointer type of pen to the synthetic WebMousEvent

content/browser/renderer_host/input/synthetic_mouse_driver.h

Index: content/browser/renderer_host/input/synthetic_mouse_driver.h
diff --git a/content/browser/renderer_host/input/synthetic_mouse_driver.h b/content/browser/renderer_host/input/synthetic_mouse_driver.h
index 04a00706411073078cb8d139222fbcb118918cf8..117ddd67385c1dec350becf89a437d05023c2045 100644
--- a/content/browser/renderer_host/input/synthetic_mouse_driver.h
+++ b/content/browser/renderer_host/input/synthetic_mouse_driver.h
@@ -15,6 +15,8 @@ namespace content {
 class CONTENT_EXPORT SyntheticMouseDriver : public SyntheticPointerDriver {
  public:
   SyntheticMouseDriver();
+  explicit SyntheticMouseDriver(
+      SyntheticGestureParams::GestureSourceType gesture_source_type);
   ~SyntheticMouseDriver() override;
 
   void DispatchEvent(SyntheticGestureTarget* target,
@@ -29,6 +31,8 @@ class CONTENT_EXPORT SyntheticMouseDriver : public SyntheticPointerDriver {
 
  private:
   blink::WebMouseEvent mouse_event_;
+  blink::WebPointerProperties::PointerType pointer_type_;
+
   DISALLOW_COPY_AND_ASSIGN(SyntheticMouseDriver);
 };