[RenderText] Added append text

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 189 matching lines @@
 
   // Creates a platform-specific or cross-platform RenderText instance.
   static RenderText* CreateInstance();
   static RenderText* CreateInstanceForEditing();
 
   // Creates another instance of the same concrete class.
   virtual scoped_ptr<RenderText> CreateInstanceOfSameType() const = 0;
 
   const base::string16& text() const { return text_; }
   void SetText(const base::string16& text);
+  void AppendText(const base::string16& text);
 
   HorizontalAlignment horizontal_alignment() const {
     return horizontal_alignment_;
   }
   void SetHorizontalAlignment(HorizontalAlignment alignment);
 
   const FontList& font_list() const { return font_list_; }
   void SetFontList(const FontList& font_list);
 
   bool cursor_enabled() const { return cursor_enabled_; }
@@ skipping 376 matching lines @@
   // Get the text direction for the current directionality mode and given
   // |text|.
   base::i18n::TextDirection GetTextDirection(const base::string16& text);
 
   // Convert an index in |text_| to the index in |given_text|. The
   // |given_text| should be either |display_text_| or |layout_text_|
   // depending on the elide state.
   size_t TextIndexToGivenTextIndex(const base::string16& given_text,
                                    size_t index);
 
+  // Adjust ranged styles to accommodate a new text length.
+  void UpdateStyleLengths();
+
   // A convenience function to check whether the glyph attached to the caret
   // is within the given range.
   static bool RangeContainsCaret(const Range& range,
                                  size_t caret_pos,
                                  LogicalCursorDirection caret_affinity);
 
  private:
   friend class RenderTextTest;
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, DefaultStyles);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, SetStyles);
@@ skipping 179 matching lines @@
   // Lines computed by EnsureLayout. These should be invalidated upon
   // OnLayoutTextAttributeChanged and OnDisplayTextAttributeChanged calls.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_