Supports the invisible underline for native input fields.

ui/views/controls/textfield/textfield.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/views/controls/textfield/textfield.h"
 
 #include <string>
 
 #include "base/trace_event/trace_event.h"
 #include "ui/accessibility/ax_view_state.h"
@@ skipping 1467 matching lines @@
   gfx::Rect rect = GetRenderText()->GetUpdatedCursorBounds();
   ConvertRectToScreen(this, &rect);
   return rect;
 }
 
 bool Textfield::GetCompositionCharacterBounds(uint32 index,
                                               gfx::Rect* rect) const {
   DCHECK(rect);
   if (!HasCompositionText())
     return false;
-  gfx::RenderText* render_text = GetRenderText();
-  const gfx::Range& composition_range = render_text->GetCompositionRange();
+  gfx::Range composition_range;
+  model_->GetCompositionTextRange(&composition_range);
   DCHECK(!composition_range.is_empty());
 
   size_t text_index = composition_range.start() + index;
   if (composition_range.end() <= text_index)
     return false;
+  gfx::RenderText* render_text = GetRenderText();
   if (!render_text->IsValidCursorIndex(text_index)) {
     text_index = render_text->IndexOfAdjacentGrapheme(
         text_index, gfx::CURSOR_BACKWARD);
   }
   if (text_index < composition_range.start())
     return false;
   const gfx::SelectionModel caret(text_index, gfx::CURSOR_BACKWARD);
   *rect = render_text->GetCursorBounds(caret, false);
   ConvertRectToScreen(this, rect);
   return true;
@@ skipping 375 matching lines @@
     RequestFocus();
   model_->MoveCursorTo(mouse);
   if (!selection_clipboard_text.empty()) {
     model_->InsertText(selection_clipboard_text);
     UpdateAfterChange(true, true);
   }
   OnAfterUserAction();
 }
 
 }  // namespace views