Allow turning on selection painting without selection gaps via window.internals.

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 355 matching lines @@
     // |useCounterId| must be one of the values from the UseCounter::Feature enum.
     bool isUseCounted(Document*, int useCounterId);
 
     String unscopeableAttribute();
     String unscopeableMethod();
 
     ClientRectList* outlineRects(Element*);
 
     void setCapsLockState(bool enabled);
 
+    void setSelectionPaintingWithoutSelectionGaps(bool enabled);

[chrishtr, 2015/09/08 22:59:02]

setSelectionPaintingWithoutSelectionGapsEnabled

[wkorman, 2015/09/08 23:08:38]

Done.

+
     bool setScrollbarVisibilityInScrollableArea(Node*, bool visible);
 
     void forceRestrictIFramePermissions();
 private:
     explicit Internals(ScriptState*);
     Document* contextDocument() const;
     LocalFrame* frame() const;
     Vector<String> iconURLs(Document*, int iconTypesMask) const;
     ClientRectList* annotatedRegions(Document*, bool draggable, ExceptionState&);
 
     DocumentMarker* markerAt(Node*, const String& markerType, unsigned index, ExceptionState&);
     Member<InternalRuntimeFlags> m_runtimeFlags;
 
     IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
 } // namespace blink
 
 #endif // Internals_h