Separate selection highlight from pango layout

ui/gfx/render_text_linux.h

Index: ui/gfx/render_text_linux.h
===================================================================
--- ui/gfx/render_text_linux.h	(revision 111848)
+++ ui/gfx/render_text_linux.h	(working copy)
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <pango/pango.h>
+#include <vector>
 
 #include "ui/gfx/render_text.h"
 
@@ -34,8 +35,14 @@
                                                 BreakType break_type) OVERRIDE;
   virtual SelectionModel LeftEndSelectionModel() OVERRIDE;
   virtual SelectionModel RightEndSelectionModel() OVERRIDE;
+  virtual void GetSubstringBounds(size_t from,
+                                  size_t to,
+                                  std::vector<Rect>* bounds) OVERRIDE;
+  virtual void SetSelectionModel(
+      const SelectionModel& selection_model) OVERRIDE;
   virtual bool IsCursorablePosition(size_t position) OVERRIDE;
   virtual void UpdateLayout() OVERRIDE;
+  virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
 
  private:
   virtual size_t IndexOfAdjacentGrapheme(size_t index, bool next) OVERRIDE;
@@ -96,6 +103,15 @@
   size_t Utf16IndexToUtf8Index(size_t index) const;
   size_t Utf8IndexToUtf16Index(size_t index) const;
 
+  // Calculate the visual bounds containing the logical substring within |from|
+  // to |to| into |bounds|.
+  void CalculateSubstringBounds(size_t from,
+                                size_t to,
+                                std::vector<Rect>* bounds);
+
+  // Save the visual bounds of logical selection into |bounds|.
+  void GetSelectionBounds(std::vector<Rect>* bounds);
+
   // Pango Layout.
   PangoLayout* layout_;
   // A single line layout resulting from laying out via |layout_|.
@@ -106,6 +122,9 @@
   // Number of attributes in |log_attrs_|.
   int num_log_attrs_;
 
+  // Vector of the visual bounds containing the logical substring of selection.
+  std::vector<Rect> selection_visual_bounds_;
+
   // The text in the |layout_|.
   const char* layout_text_;
   // The text length.