Fix graphics layer backing and offset for composited selection handles.

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 cff1a956a7c7c0dd46fa48a965de40e35eb8f1c9..5d014a424bfee0cd04c655830fae85c3aadd046f 100644
--- a/third_party/WebKit/Source/core/editing/RenderedPosition.h
+++ b/third_party/WebKit/Source/core/editing/RenderedPosition.h
@@ -38,6 +38,8 @@
 
 namespace blink {
 
+class GraphicsLayer;
+class LayoutPoint;
 class LayoutUnit;
 class LayoutObject;
 struct CompositedSelectionBound;
@@ -102,6 +104,10 @@ class RenderedPosition {
   bool atRightBoundaryOfBidiRun(ShouldMatchBidiLevel,
                                 unsigned char bidiLevelOfRun) const;
 
+  FloatPoint localToInvalidationBackingPoint(
+      const LayoutPoint& localPoint,
+      GraphicsLayer** graphicsLayerBacking) const;
+
   LayoutObject* m_layoutObject;
   InlineBox* m_inlineBox;
   int m_offset;