Move LeftPositionOf() and RightPositionOf() to SelectionModifierCharacter.cpp

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

Index: third_party/WebKit/Source/core/editing/SelectionModifier.h
diff --git a/third_party/WebKit/Source/core/editing/SelectionModifier.h b/third_party/WebKit/Source/core/editing/SelectionModifier.h
index 5a00050ee09d0aee04c09f78ddb947b723db5dd5..50a0b1db83bcec8a6e200f318138ec296aaa3885 100644
--- a/third_party/WebKit/Source/core/editing/SelectionModifier.h
+++ b/third_party/WebKit/Source/core/editing/SelectionModifier.h
@@ -98,6 +98,22 @@ class SelectionModifier {
 
 LayoutUnit NoXPosForVerticalArrowNavigation();
 
+// Following functions are exported for using in SelectionModifier and
+// testing only.
+
+// TODO(yosin) Since return value of |leftPositionOf()| with |VisiblePosition|
+// isn't defined well on flat tree, we should not use it for a position in
+// flat tree.
+CORE_EXPORT VisiblePosition LeftPositionOf(const VisiblePosition&);
+CORE_EXPORT VisiblePositionInFlatTree
+LeftPositionOf(const VisiblePositionInFlatTree&);
+// TODO(yosin) Since return value of |rightPositionOf()| with |VisiblePosition|
+// isn't defined well on flat tree, we should not use it for a position in
+// flat tree.
+CORE_EXPORT VisiblePosition RightPositionOf(const VisiblePosition&);
+CORE_EXPORT VisiblePositionInFlatTree
+RightPositionOf(const VisiblePositionInFlatTree&);
+
 }  // namespace blink
 
 #endif  // SelectionModifier_h