Implement basic parts of hit regions on canvas2d.

Source/core/testing/Internals.h

 /*
  * 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 23 matching lines @@
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/page/scrolling/ScrollingCoordinator.h"
 #include "platform/heap/Handle.h"
 #include "wtf/ArrayBuffer.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
+class CanvasRenderingContext2D;
 class ClientRect;
 class ClientRectList;
 class DOMPoint;
 class DOMStringList;
 class LocalDOMWindow;
 class Document;
 class DocumentMarker;
 class Element;
 class ExceptionState;
 class ExecutionContext;
@@ skipping 260 matching lines @@
     String textSurroundingNode(Node*, int x, int y, unsigned long maxLength);
 
     void setFocused(bool);
 
     bool ignoreLayoutWithPendingStylesheets(Document*, ExceptionState&);
 
     void setNetworkStateNotifierTestOnly(bool);
     // Test must call setNetworkStateNotifierTestOnly(true) before calling setNetworkConnectionInfo.
     void setNetworkConnectionInfo(const String&, ExceptionState&);
 
+    unsigned countHitRegions(CanvasRenderingContext2D*);
+
 private:
     explicit Internals(Document*);
     Document* contextDocument() const;
     LocalFrame* frame() const;
     Vector<String> iconURLs(Document*, int iconTypesMask) const;
     PassRefPtrWillBeRawPtr<ClientRectList> annotatedRegions(Document*, bool draggable, ExceptionState&);
 
     DocumentMarker* markerAt(Node*, const String& markerType, unsigned index, ExceptionState&);
     RefPtrWillBeMember<InternalRuntimeFlags> m_runtimeFlags;
     RefPtrWillBeMember<InternalProfilers> m_profilers;
 };
 
 } // namespace WebCore
 
 #endif