MacViews: Implement Force Touch/Mac dictionary lookup for Textfields.

ui/views/controls/textfield/textfield_model.cc

 // Copyright 2014 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_model.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 606 matching lines @@
   if (HasCompositionText())
     CancelCompositionText();
   ExecuteAndRecordReplace(DO_NOT_MERGE,
                           GetCursorPosition(),
                           position + new_text.length(),
                           new_text,
                           position);
 }
 
 base::string16 TextfieldModel::GetTextFromRange(const gfx::Range& range) const {
-  if (range.IsValid() && range.GetMin() < text().length())
-    return text().substr(range.GetMin(), range.length());
-  return base::string16();
+  return render_text_->GetTextFromRange(range);
 }
 
 void TextfieldModel::GetTextRange(gfx::Range* range) const {
   *range = gfx::Range(0, text().length());
 }
 
 void TextfieldModel::SetCompositionText(
     const ui::CompositionText& composition) {
   if (HasCompositionText())
     CancelCompositionText();
@@ skipping 213 matching lines @@
   render_text_->SetCursorPosition(new_cursor_pos);
   // TODO(oshima): Select text that was just undone, like Mac (but not GTK).
 }
 
 // static
 void TextfieldModel::ClearKillBuffer() {
   SetKillBuffer(base::string16());
 }
 
 }  // namespace views