Fix selection rect calculation for inline elements with padding

Source/core/rendering/RootInlineBox.h

Index: Source/core/rendering/RootInlineBox.h
diff --git a/Source/core/rendering/RootInlineBox.h b/Source/core/rendering/RootInlineBox.h
index 32b1c55221d0ee4da61fd42fe4d73b80f0639c37..2a4f9ec95a7b43321ad231829a5617d1613ef3d1 100644
--- a/Source/core/rendering/RootInlineBox.h
+++ b/Source/core/rendering/RootInlineBox.h
@@ -73,12 +73,13 @@ public:
     int blockDirectionPointInLine() const;
 
     LayoutUnit alignBoxesInBlockDirection(LayoutUnit heightOfBlock, GlyphOverflowAndFallbackFontsMap&, VerticalPositionCache&);
-    void setLineTopBottomPositions(LayoutUnit top, LayoutUnit bottom, LayoutUnit topWithLeading, LayoutUnit bottomWithLeading)
+    void setLineTopBottomPositions(LayoutUnit top, LayoutUnit bottom, LayoutUnit topWithLeading, LayoutUnit bottomWithLeading, LayoutUnit selectionBottom = LayoutUnit::min())
     {
         m_lineTop = top;
         m_lineBottom = bottom;
         m_lineTopWithLeading = topWithLeading;
         m_lineBottomWithLeading = bottomWithLeading;
+        m_selectionBottom = selectionBottom == LayoutUnit::min() ? bottom : selectionBottom;
     }
 
     virtual RenderLineBoxList* rendererLineBoxes() const OVERRIDE FINAL;
@@ -213,6 +214,8 @@ private:
     LayoutUnit m_lineTopWithLeading;
     LayoutUnit m_lineBottomWithLeading;
 
+    LayoutUnit m_selectionBottom;
+
     struct LineFragmentationData {
         WTF_MAKE_NONCOPYABLE(LineFragmentationData); WTF_MAKE_FAST_ALLOCATED;
     public: