Supports the invisible underline for native input fields.

ui/gfx/render_text.cc

 // 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.
 
 #include "ui/gfx/render_text.h"
 
 #include <algorithm>
 #include <climits>
 
 #include "base/command_line.h"
@@ skipping 665 matching lines @@
 
   for (; selection_max < text().length(); ++selection_max)
     if (iter.IsEndOfWord(selection_max) || iter.IsStartOfWord(selection_max))
       break;
 
   const bool reversed = selection().is_reversed();
   MoveCursorTo(reversed ? selection_max : selection_min, false);
   MoveCursorTo(reversed ? selection_min : selection_max, true);
 }
 
-const Range& RenderText::GetCompositionRange() const {
-  return composition_range_;
-}
-
 void RenderText::SetCompositionRange(const Range& composition_range) {
   CHECK(!composition_range.IsValid() ||
         Range(0, text_.length()).Contains(composition_range));
   composition_range_.set_end(composition_range.end());
   composition_range_.set_start(composition_range.start());
   // TODO(oshima|msw): Altering composition underlines shouldn't
   // require layout changes. It's currently necessary because
   // RenderTextHarfBuzz paints text decorations by run, and
   // RenderTextMac applies all styles during layout.
   OnLayoutTextAttributeChanged(false);
@@ skipping 807 matching lines @@
 
   SetDisplayOffset(display_offset_.x() + delta_x);
 }
 
 void RenderText::DrawSelection(Canvas* canvas) {
   for (const Rect& s : GetSubstringBounds(selection()))
     canvas->FillRect(s, selection_background_focused_color_);
 }
 
 }  // namespace gfx