Adding chrome flag to disable implicit capture

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

 // Copyright 2016 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.
 
 #include "core/input/PointerEventManager.h"
 
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/shadow/FlatTreeTraversal.h"
 #include "core/events/MouseEvent.h"
 #include "core/frame/FrameView.h"
@@ skipping 476 matching lines @@
 
 WebInputEventResult PointerEventManager::sendTouchPointerEvent(
     EventTarget* target, PointerEvent* pointerEvent)
 {
     if (m_inCanceledStateForPointerTypeTouch)
         return WebInputEventResult::NotHandled;
 
     processCaptureAndPositionOfPointerEvent(pointerEvent, target);
 
     // Setting the implicit capture for touch
-    if (pointerEvent->type() == EventTypeNames::pointerdown)
+    if (!RuntimeEnabledFeatures::pointerEventNoImplicitCaptureEnabled()
+        && pointerEvent->type() == EventTypeNames::pointerdown)
         setPointerCapture(pointerEvent->pointerId(), target);
 
     WebInputEventResult result = dispatchPointerEvent(
         getEffectiveTargetForPointerEvent(target, pointerEvent->pointerId()),
         pointerEvent);
 
     if (pointerEvent->type() == EventTypeNames::pointerup
         || pointerEvent->type() == EventTypeNames::pointercancel) {
         releasePointerCapture(pointerEvent->pointerId());
 
@@ skipping 297 matching lines @@
 {
     visitor->trace(m_frame);
     visitor->trace(m_nodeUnderPointer);
     visitor->trace(m_pointerCaptureTarget);
     visitor->trace(m_pendingPointerCaptureTarget);
     visitor->trace(m_touchEventManager);
 }
 
 
 } // namespace blink