Move slider implemention to use pointer capture

third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 159 matching lines @@
   // FIXME: This is no longer being set from renderer. Consider updating the
   // method name.
   input->setValueFromRenderer(valueString);
   if (layoutObject())
     layoutObject()->setNeedsLayoutAndFullPaintInvalidation(
         LayoutInvalidationReason::SliderValueChanged);
 }
 
 void SliderThumbElement::startDragging() {
   if (LocalFrame* frame = document().frame()) {
-    frame->eventHandler().setCapturingMouseEventsNode(this);
+    // Note that we get to here only we through mouse event path. The touch
+    // events are implicitly captured to the starting element and will be
+    // handled in handleTouchEvent function.
+    frame->eventHandler().setPointerCapture(PointerEventFactory::s_mouseId,
+                                            this);
     m_inDragMode = true;
   }
 }
 
 void SliderThumbElement::stopDragging() {
   if (!m_inDragMode)
     return;
 
-  if (LocalFrame* frame = document().frame())
-    frame->eventHandler().setCapturingMouseEventsNode(nullptr);
+  if (LocalFrame* frame = document().frame()) {
+    frame->eventHandler().releasePointerCapture(PointerEventFactory::s_mouseId,
+                                                this);
+  }
   m_inDragMode = false;
   if (layoutObject())
     layoutObject()->setNeedsLayoutAndFullPaintInvalidation(
         LayoutInvalidationReason::SliderValueChanged);
   if (hostInput())
     hostInput()->dispatchFormControlChangeEvent();
 }
 
 void SliderThumbElement::defaultEventHandler(Event* event) {
+  if (event->isPointerEvent() &&
+      event->type() == EventTypeNames::lostpointercapture) {
+    stopDragging();
+    return;
+  }
+
   if (!event->isMouseEvent()) {
     HTMLDivElement::defaultEventHandler(event);
     return;
   }
 
   // FIXME: Should handle this readonly/disabled check in more general way.
   // Missing this kind of check is likely to occur elsewhere if adding it in
   // each shadow element.
   HTMLInputElement* input = hostInput();
   if (!input || input->isDisabledFormControl()) {
@@ skipping 237 matching lines @@
   updateTouchEventHandlerRegistry();
   HTMLElement::didMoveToNewDocument(oldDocument);
 }
 
 void SliderContainerElement::removeAllEventListeners() {
   Node::removeAllEventListeners();
   m_hasTouchEventHandler = false;
 }
 
 }  // namespace blink