Implement basic parts of hit regions on canvas2d.

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 f312c9065ea572bb4fa5ec9c5ff465903a591a6a..fe4b9e9930cdfb18779738990aada9130daa493a 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -89,6 +89,7 @@
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLSelectElement.h"
 #include "core/html/HTMLTextAreaElement.h"
+#include "core/html/canvas/CanvasRenderingContext2D.h"
 #include "core/html/forms/FormController.h"
 #include "core/html/shadow/ShadowElementNames.h"
 #include "core/html/shadow/TextControlInnerElements.h"
@@ -2375,4 +2376,12 @@ void Internals::setNetworkConnectionInfo(const String& type, ExceptionState& exc
     networkStateNotifier().setWebConnectionTypeForTest(webtype);
 }
 
+unsigned Internals::countHitRegions(CanvasRenderingContext2D* context)
+{
+    if (!context)
+        return -1;
+
+    return context->hitRegionsCount();
+}
+
 } // namespace WebCore