Exclude scrollbars from visual viewport dimensions

third_party/WebKit/Source/platform/scroll/ScrollableArea.h

 /*
  * Copyright (C) 2008, 2011 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 251 matching lines @@
     // which bails out early if its already in updateScrollbars, the effect being
     // that programmatic scrolls (i.e. setScrollPosition) are disabled when in
     // updateScrollbars. Expose this here to allow RootFrameViewport to match the
     // semantics for now but it should be cleaned up at the source.
     virtual bool isProgrammaticallyScrollable() { return true; }
 
     // Subtracts space occupied by this ScrollableArea's scrollbars.
     // Does nothing if overlay scrollbars are enabled.
     IntSize excludeScrollbars(const IntSize&) const;
 
+    // Returns 0 if overlay scrollbars are enabled.
+    int verticalScrollbarWidth() const;
+    int horizontalScrollbarHeight() const;
+
     // Returns the widget associated with this ScrollableArea.
     virtual Widget* getWidget() { return nullptr; }
 
     virtual bool isFrameView() const { return false; }
     virtual bool isPaintLayerScrollableArea() const { return false; }
 
     // Need to promptly let go of owned animator objects.
     EAGERLY_FINALIZE();
     DECLARE_VIRTUAL_TRACE();
 
@@ skipping 54 matching lines @@
     // vertical-lr / ltr            NO                      NO
     // vertical-lr / rtl            NO                      YES
     // vertical-rl / ltr            YES                     NO
     // vertical-rl / rtl            YES                     YES
     IntPoint m_scrollOrigin;
 };
 
 } // namespace blink
 
 #endif // ScrollableArea_h