Add test to track the number of hit tests on various events

Source/core/rendering/RenderView.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 29 matching lines @@
 // the visible viewport in fixed-layout mode), and it is always at position (0,0)
 // relative to the document (and so isn't necessarily in view).
 class RenderView FINAL : public RenderBlockFlow {
 public:
     explicit RenderView(Document*);
     virtual ~RenderView();
 
     bool hitTest(const HitTestRequest&, HitTestResult&);
     bool hitTest(const HitTestRequest&, const HitTestLocation&, HitTestResult&);
 
+    // Returns the count of calls to HitTest since this was last called.
+    // Used by tests that catch unnecessary hit-tests.
+    unsigned hitTestCountDelta();
+
     virtual const char* renderName() const OVERRIDE { return "RenderView"; }
 
     virtual bool isRenderView() const OVERRIDE { return true; }
 
     virtual LayerType layerTypeRequired() const OVERRIDE { return NormalLayer; }
 
     virtual bool isChildAllowed(RenderObject*, RenderStyle*) const OVERRIDE;
 
     virtual void layout() OVERRIDE;
     virtual void updateLogicalWidth() OVERRIDE;
@@ skipping 136 matching lines @@
 
     LayoutUnit m_pageLogicalHeight;
     bool m_pageLogicalHeightChanged;
     LayoutState* m_layoutState;
     OwnPtr<RenderLayerCompositor> m_compositor;
     OwnPtr<FlowThreadController> m_flowThreadController;
     RefPtr<IntervalArena> m_intervalArena;
 
     RenderQuote* m_renderQuoteHead;
     unsigned m_renderCounterCount;
+
+    unsigned m_hitTestCount;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderView, isRenderView());
 
 // Suspends the LayoutState cached offset and clipRect optimization. Used under transforms
 // that cannot be represented by LayoutState (common in SVG) and when manipulating the render
 // tree during layout in ways that can trigger repaint of a non-child (e.g. when a list item
 // moves its list marker around). Note that even when disabled, LayoutState is still used to
 // store layoutDelta.
 class ForceHorriblySlowRectMapping {
@@ skipping 20 matching lines @@
     RenderView& m_view;
     bool m_didDisable;
 #if ASSERT_ENABLED
     LayoutState* m_layoutState;
 #endif
 };
 
 } // namespace WebCore
 
 #endif // RenderView_h