[Touch Adjustment] Pass primary_pointer_type to WebGestureEvent and disable adjustment for stylus

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 1346 matching lines @@
 
 bool EventHandler::IsScrollbarHandlingGestures() const {
   return scroll_manager_->IsScrollbarHandlingGestures();
 }
 
 bool EventHandler::ShouldApplyTouchAdjustment(
     const WebGestureEvent& event) const {
   if (frame_->GetSettings() &&
       !frame_->GetSettings()->GetTouchAdjustmentEnabled())
     return false;
+
+  if (event.primary_pointer_type == WebPointerProperties::PointerType::kPen)
+    return false;
+
   return !event.TapAreaInRootFrame().IsEmpty();
 }
 
 bool EventHandler::BestClickableNodeForHitTestResult(
     const HitTestResult& result,
     IntPoint& target_point,
     Node*& target_node) {
   // FIXME: Unify this with the other best* functions which are very similar.
 
   TRACE_EVENT0("input", "EventHandler::bestClickableNodeForHitTestResult");
@@ skipping 715 matching lines @@
     MouseEventWithHitTestResults& mev,
     LocalFrame* subframe) {
   WebInputEventResult result =
       subframe->GetEventHandler().HandleMouseReleaseEvent(mev.Event());
   if (result != WebInputEventResult::kNotHandled)
     return result;
   return WebInputEventResult::kHandledSystem;
 }
 
 }  // namespace blink