Added counters for pointer boundary events fired.

third_party/WebKit/Source/core/input/PointerEventManager.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 PointerEventManager_h
 #define PointerEventManager_h
 
 #include "core/CoreExport.h"
 #include "core/events/PointerEvent.h"
 #include "core/events/PointerEventFactory.h"
@@ skipping 47 matching lines @@
         const PlatformMouseEvent&,
         bool isFrameBoundaryTransition);
 
     // Resets the internal state of this object.
     void clear();
 
     void elementRemoved(EventTarget*);
 
     void setPointerCapture(int, EventTarget*);
     void releasePointerCapture(int, EventTarget*);
-    bool hasPointerCapture(int, EventTarget*);
+    bool hasPointerCapture(int, const EventTarget*) const;
 
     bool isActive(const int) const;
 
     // Returns whether there is any touch on the screen.
     bool isAnyTouchActive() const;
 
     // TODO(crbug.com/625843): This can be hidden when mouse refactoring in EventHandler is done.
     EventTarget* getMouseCapturingNode();
 
     // Returns true if the primary pointerdown corresponding to the given
@@ skipping 109 matching lines @@
     PointerCapturingMap m_pointerCaptureTarget;
     PointerCapturingMap m_pendingPointerCaptureTarget;
 
     PointerEventFactory m_pointerEventFactory;
     TouchEventManager m_touchEventManager;
 };
 
 } // namespace blink
 
 #endif // PointerEventManager_h