Add VisibleUnits::startOfWordPosition

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

Index: third_party/WebKit/Source/core/editing/VisibleUnits.h
diff --git a/third_party/WebKit/Source/core/editing/VisibleUnits.h b/third_party/WebKit/Source/core/editing/VisibleUnits.h
index 154a984549026e37407cac24f0b306b2194e63ef..5afbadd488438e9be5be22264a58f92ed8073369 100644
--- a/third_party/WebKit/Source/core/editing/VisibleUnits.h
+++ b/third_party/WebKit/Source/core/editing/VisibleUnits.h
@@ -156,8 +156,16 @@ previousPositionOf(const VisiblePositionInFlatTree&,
                    EditingBoundaryCrossingRule = CanCrossEditingBoundary);
 
 // words
+// TODO(yoichio): Replace |startOfWord| to |startOfWordPosition| because
+// returned Position should be canonicalized with |previousBoundary()| by
+// TextItetator.
+CORE_EXPORT Position startOfWordPosition(const VisiblePosition&,
+                                         EWordSide = RightWordIfOnBoundary);
 CORE_EXPORT VisiblePosition startOfWord(const VisiblePosition&,
                                         EWordSide = RightWordIfOnBoundary);
+CORE_EXPORT PositionInFlatTree
+startOfWordPosition(const VisiblePositionInFlatTree&,
+                    EWordSide = RightWordIfOnBoundary);
 CORE_EXPORT VisiblePositionInFlatTree
 startOfWord(const VisiblePositionInFlatTree&,
             EWordSide = RightWordIfOnBoundary);