Fix selection handles in vertical writing modes.

third_party/WebKit/Source/core/editing/RenderedPosition.h

Index: third_party/WebKit/Source/core/editing/RenderedPosition.h
diff --git a/third_party/WebKit/Source/core/editing/RenderedPosition.h b/third_party/WebKit/Source/core/editing/RenderedPosition.h
index 3ef2e6b671b626f4ed2d651fb0f211f0f6f82173..12889d515483024e7195002a5413fa0037d8c9c2 100644
--- a/third_party/WebKit/Source/core/editing/RenderedPosition.h
+++ b/third_party/WebKit/Source/core/editing/RenderedPosition.h
@@ -72,7 +72,8 @@ public:
     Position positionAtRightBoundaryOfBiDiRun() const;
 
     IntRect absoluteRect(LayoutUnit* extraWidthToEndOfLine = 0) const;
-    void positionInGraphicsLayerBacking(CompositedSelectionBound&) const;
+
+    void positionInGraphicsLayerBacking(CompositedSelectionBound&, bool selectionStart) const;
 
 private:
     bool operator==(const RenderedPosition&) const { return false; }