Add use counter when touch-action isn't used when preventDefault'd.

third_party/WebKit/Source/core/input/TouchEventManager.h

 // 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.
 
 #ifndef TouchEventManager_h
 #define TouchEventManager_h
 
 #include "core/CoreExport.h"
 #include "core/events/PointerEventFactory.h"
 #include "public/platform/WebInputEventResult.h"
@@ skipping 78 matching lines @@
                                  WTF::UnsignedWithZeroKeyHashTraits<unsigned>>;
   TouchRegionMap m_regionForTouchID;
 
   // If set, the document of the active touch sequence. Unset if no touch
   // sequence active.
   Member<Document> m_touchSequenceDocument;
 
   bool m_touchPressed;
   // The touch event currently being handled or NoType if none.
   PlatformEvent::EventType m_currentEvent;
+
+  // The current touch action, computed on each touch start and is
+  // a union of all touches. Reset when all touches are released.
+  TouchAction m_currentTouchAction;
 };
 
 }  // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::TouchEventManager::TouchInfo);
 
 #endif  // TouchEventManager_h