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

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 278 matching lines @@
         return 0;
     }
 
     bool isPartial;
     unsigned needsLayoutObjects;
     unsigned totalObjects;
     contextFrame->countObjectsNeedingLayout(needsLayoutObjects, totalObjects, isPartial);
     return needsLayoutObjects;
 }
 
+unsigned Internals::hitTestCountDelta(Document* doc, ExceptionState& exceptionState) const

[esprehn, 2014/06/26 02:33:50]

no "Delta".

[Rick Byers, 2014/06/26 15:35:18]

Done.

+{
+    if (!doc) {
+        exceptionState.throwDOMException(InvalidAccessError, "Must supply document to check");
+        return 0;
+    }
+
+    return doc->renderView()->hitTestCountDelta();
+}
+
+
 bool Internals::isPreloaded(const String& url)
 {
     Document* document = contextDocument();
     return document->fetcher()->isPreloaded(url);
 }
 
 bool Internals::isLoadingFromMemoryCache(const String& url)
 {
     if (!contextDocument())
         return false;
@@ skipping 2014 matching lines @@
     }
     networkStateNotifier().setWebConnectionTypeForTest(webtype);
 }
 
 unsigned Internals::countHitRegions(CanvasRenderingContext2D* context)
 {
     return context->hitRegionsCount();
 }
 
 } // namespace WebCore