Introduce LayoutObject::createPositionWithAffinity(int offset)

Source/core/layout/LayoutText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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 577 matching lines @@
         return createPositionWithAffinityForBox(leftmostBox,
             box->isLeftToRightDirection() ? leftmostBox->caretMinOffset() : leftmostBox->caretMaxOffset(), shouldAffinityBeDownstream);
     }
 
     return createPositionWithAffinityForBox(box, box->caretLeftmostOffset(), shouldAffinityBeDownstream);
 }
 
 PositionWithAffinity LayoutText::positionForPoint(const LayoutPoint& point)
 {
     if (!firstTextBox() || textLength() == 0)
-        return createPositionWithAffinity(0, DOWNSTREAM);
+        return createPositionWithAffinity(0);
 
     LayoutUnit pointLineDirection = firstTextBox()->isHorizontal() ? point.x() : point.y();
     LayoutUnit pointBlockDirection = firstTextBox()->isHorizontal() ? point.y() : point.x();
     bool blocksAreFlipped = style()->isFlippedBlocksWritingMode();
 
     InlineTextBox* lastBox = nullptr;
     for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
         if (box->isLineBreak() && !box->prevLeafChild() && box->nextLeafChild() && !box->nextLeafChild()->isLineBreak())
             box = box->nextTextBox();
 
@@ skipping 11 matching lines @@
             }
         }
         lastBox = box;
     }
 
     if (lastBox) {
         ShouldAffinityBeDownstream shouldAffinityBeDownstream;
         lineDirectionPointFitsInBox(pointLineDirection, lastBox, shouldAffinityBeDownstream);
         return createPositionWithAffinityForBoxAfterAdjustingOffsetForBiDi(lastBox, lastBox->offsetForPosition(pointLineDirection.toFloat()) + lastBox->start(), shouldAffinityBeDownstream);
     }
-    return createPositionWithAffinity(0, DOWNSTREAM);
+    return createPositionWithAffinity(0);
 }
 
 LayoutRect LayoutText::localCaretRect(InlineBox* inlineBox, int caretOffset, LayoutUnit* extraWidthToEndOfLine)
 {
     if (!inlineBox)
         return LayoutRect();
 
     ASSERT(inlineBox->isInlineTextBox());
     if (!inlineBox->isInlineTextBox())
         return LayoutRect();
@@ skipping 1235 matching lines @@
     for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
         paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*box);
         if (box->truncation() != cNoTruncation) {
             if (EllipsisBox* ellipsisBox = box->root().ellipsisBox())
                 paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*ellipsisBox);
         }
     }
 }
 
 } // namespace blink