RenderText: Allow setting display offset explicitly

ui/gfx/render_text.h

Index: ui/gfx/render_text.h
diff --git a/ui/gfx/render_text.h b/ui/gfx/render_text.h
index 3c87440eddd7f4da2852a61348607c0b348abc70..c69063fcf8073a22a25f88ed686616c7301a83a2 100644
--- a/ui/gfx/render_text.h
+++ b/ui/gfx/render_text.h
@@ -421,6 +421,9 @@ class GFX_EXPORT RenderText {
   // Rect can't have a negative width.)
   virtual Range GetGlyphBounds(size_t index) = 0;
 
+  const Vector2d& GetUpdatedDisplayOffset();
+  void SetDisplayOffset(const Vector2d& offset);
+
  protected:
   RenderText();
 
@@ -454,8 +457,6 @@ class GFX_EXPORT RenderText {
   // returns the difference between them.
   virtual int GetLayoutTextBaseline() = 0;
 
-  const Vector2d& GetUpdatedDisplayOffset();
-
   void set_cached_bounds_and_offset_valid(bool valid) {
     cached_bounds_and_offset_valid_ = valid;
   }