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

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 05fd3f92a0893982f5b9a9bf378e926d135aca1c..a00980f83baa64bb31ec8f1b8a2742fe0aab0ff4 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -296,6 +296,17 @@ unsigned Internals::needsLayoutCount(ExceptionState& exceptionState) const
     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();