Add TextRange and related methods to Textfield Views.

views/controls/textfield/native_textfield_gtk.cc

Index: views/controls/textfield/native_textfield_gtk.cc
diff --git a/views/controls/textfield/native_textfield_gtk.cc b/views/controls/textfield/native_textfield_gtk.cc
index d5b16192c46071869d8b0f4362d9a057fa838772..f713c4e6e4d02a1945f2030421b09a1bb07c940a 100644
--- a/views/controls/textfield/native_textfield_gtk.cc
+++ b/views/controls/textfield/native_textfield_gtk.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -343,6 +343,19 @@ bool NativeTextfieldGtk::IsIMEComposing() const {
   return false;
 }
 
+void NativeTextfieldGtk::GetSelectedRange(TextRange* range) const {
+  NOTREACHED();
+}
+
+void NativeTextfieldGtk::SelectRange(const TextRange& range) {
+  NOTREACHED();
+}
+
+size_t NativeTextfieldGtk::GetCursorPosition() const {
+  NOTREACHED();
+  return 0U;
+}
+
 bool NativeTextfieldGtk::HandleKeyPressed(const views::KeyEvent& e) {
   return false;
 }