Fix invalid selection produced when dragging mouse outside the SVG text element

third_party/WebKit/Source/core/layout/svg/SVGLayoutSupport.h

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 90 matching lines @@
     // Determines whether a svg node should isolate or not based on ComputedStyle.
     static bool willIsolateBlendingDescendantsForStyle(const ComputedStyle&);
     static bool willIsolateBlendingDescendantsForObject(const LayoutObject*);
     template<typename LayoutObjectType>
     static bool computeHasNonIsolatedBlendingDescendants(const LayoutObjectType*);
     static bool isIsolationRequired(const LayoutObject*);
 
     static AffineTransform deprecatedCalculateTransformToLayer(const LayoutObject*);
     static float calculateScreenFontSizeScalingFactor(const LayoutObject*);
 
+    static LayoutObject* findClosestLayoutSVGText(LayoutObject*, const FloatPoint&);
+
 private:
     static void updateObjectBoundingBox(FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, LayoutObject* other, FloatRect otherBoundingBox);
     static bool layoutSizeOfNearestViewportChanged(const LayoutObject* start);
 };
 
 class SubtreeContentTransformScope {
     STACK_ALLOCATED();
 public:
     SubtreeContentTransformScope(const AffineTransform&);
     ~SubtreeContentTransformScope();
@@ skipping 13 matching lines @@
             return true;
         if (child->hasNonIsolatedBlendingDescendants() && !willIsolateBlendingDescendantsForObject(child))
             return true;
     }
     return false;
 }
 
 } // namespace blink
 
 #endif // SVGLayoutSupport_h