Implement basic parts of hit regions on canvas2d.

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 71 matching lines @@
 #include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLContentElement.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLInputElement.h"
 #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"
 #include "core/inspector/InspectorClient.h"
 #include "core/inspector/InspectorConsoleAgent.h"
 #include "core/inspector/InspectorController.h"
 #include "core/inspector/InspectorCounters.h"
 #include "core/inspector/InspectorFrontendChannel.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorOverlay.h"
@@ skipping 2266 matching lines @@
         webtype = blink::ConnectionTypeOther;
     } else if (type == "none") {
         webtype = blink::ConnectionTypeNone;
     } else {
         exceptionState.throwDOMException(NotFoundError, ExceptionMessages::failedToEnumerate("connection type", type));
         return;
     }
     networkStateNotifier().setWebConnectionTypeForTest(webtype);
 }
 
+unsigned Internals::countHitRegions(CanvasRenderingContext2D* context)
+{
+    if (!context)
+        return -1;
+
+    return context->hitRegionsCount();
+}
+
 } // namespace WebCore