Select last word when double clicked after the last character

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 "base/i18n/break_iterator.h"
 #include "base/logging.h"
@@ skipping 457 matching lines @@
 
   size_t cursor_pos = cursor_position();
 
   base::i18n::BreakIterator iter(text(), base::i18n::BreakIterator::BREAK_WORD);
   bool success = iter.Init();
   DCHECK(success);
   if (!success)
     return;
 
   size_t selection_start = cursor_pos;
+  if (selection_start == text().length() && selection_start != 0)
+    --selection_start;
+
   for (; selection_start != 0; --selection_start) {
     if (iter.IsStartOfWord(selection_start) ||
         iter.IsEndOfWord(selection_start))
       break;
   }
 
   if (selection_start == cursor_pos)
     ++cursor_pos;
 
   for (; cursor_pos < text().length(); ++cursor_pos)
@@ skipping 478 matching lines @@
 void RenderText::DrawCursor(Canvas* canvas) {
   // Paint cursor. Replace cursor is drawn as rectangle for now.
   // TODO(msw): Draw a better cursor with a better indication of association.
   if (cursor_enabled() && cursor_visible() && focused()) {
     canvas->FillRect(GetUpdatedCursorBounds(),
         insert_mode_ ? cursor_color_ : selection_background_unfocused_color_);
   }
 }
 
 }  // namespace gfx