[RenderText] Added append text

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 6170c57c28a88251cfa2c7214fe709995789ffb8..a2fb2d8bad83135457f313def4611bd455a26de3 100644
--- a/ui/gfx/render_text.h
+++ b/ui/gfx/render_text.h
@@ -207,6 +207,7 @@ class GFX_EXPORT RenderText {
 
   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_;
@@ -603,6 +604,8 @@ class GFX_EXPORT RenderText {
   size_t TextIndexToGivenTextIndex(const base::string16& given_text,
                                    size_t index);
 
+  void UpdateStyleLengths();

[msw, 2015/03/20 00:24:11]

nit: move the comment in the function body out to be a function comment here:
  // Adjust ranged styles to accommodate a new text length.

[dschuyler, 2015/03/20 00:46:16]

Done.

+
   // A convenience function to check whether the glyph attached to the caret
   // is within the given range.
   static bool RangeContainsCaret(const Range& range,