RenderText: Allow setting display offset explicitly

ui/gfx/render_text.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <algorithm>
 #include <cstring>
 #include <string>
@@ skipping 403 matching lines @@
   // specifies the character range for which the corresponding font has been
   // chosen.
   virtual std::vector<FontSpan> GetFontSpansForTesting() = 0;
 
   // Gets the horizontal bounds (relative to the left of the text, not the view)
   // of the glyph starting at |index|. If the glyph is RTL then the returned
   // Range will have is_reversed() true.  (This does not return a Rect because a
   // Rect can't have a negative width.)
   virtual Range GetGlyphBounds(size_t index) = 0;
 
+  const Vector2d& GetUpdatedDisplayOffset();
+  void SetDisplayOffset(const Vector2d& offset);
+
  protected:
   RenderText();
 
   const BreakList<SkColor>& colors() const { return colors_; }
   const std::vector<BreakList<bool> >& styles() const { return styles_; }
 
   const std::vector<internal::Line>& lines() const { return lines_; }
   void set_lines(std::vector<internal::Line>* lines) { lines_.swap(*lines); }
 
   // Returns the baseline of the current text.  The return value depends on
@@ skipping 13 matching lines @@
   // then the baseline of FontA may be returned.  If the text includes some
   // characters which are laid out with FontB, then the baseline of FontB may
   // be returned.
   //
   // GetBaseline() returns the fixed baseline regardless of the text.
   // GetLayoutTextBaseline() returns the baseline determined by the underlying
   // layout engine, and it changes depending on the text.  GetAlignmentOffset()
   // 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;
   }
 
   // Get the selection model that visually neighbors |position| by |break_type|.
   // The returned value represents a cursor/caret position without a selection.
   SelectionModel GetAdjacentSelectionModel(const SelectionModel& current,
                                            BreakType break_type,
                                            VisualCursorDirection direction);
 
@@ skipping 231 matching lines @@
   // Lines computed by EnsureLayout. These should be invalidated with
   // ResetLayout and on |display_rect_| changes.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_