Disable drag and drop when we use stylus on Windows

third_party/WebKit/Source/core/input/MouseEventManager.cpp

Index: third_party/WebKit/Source/core/input/MouseEventManager.cpp
diff --git a/third_party/WebKit/Source/core/input/MouseEventManager.cpp b/third_party/WebKit/Source/core/input/MouseEventManager.cpp
index 50f262553678655b7ba9b9db05f8ae401c584405..a09bc63f3a8b4235f5b8c0b4382d8314be657016 100644
--- a/third_party/WebKit/Source/core/input/MouseEventManager.cpp
+++ b/third_party/WebKit/Source/core/input/MouseEventManager.cpp
@@ -755,6 +755,10 @@ WebInputEventResult MouseEventManager::HandleMouseDraggedEvent(
   if (!mouse_pressed_)
     return WebInputEventResult::kNotHandled;
 
+  if (event.Event().pointer_type ==
+      blink::WebPointerProperties::PointerType::kPen)
+    return WebInputEventResult::kNotHandled;
+
   if (HandleDrag(event, DragInitiator::kMouse))
     return WebInputEventResult::kHandledSystem;