Fix crash in touch layout code. Without this can end up indexing into

chrome/browser/ui/views/tabs/touch_tab_strip_layout.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 "chrome/browser/ui/views/tabs/touch_tab_strip_layout.h"
 
 #include <stdio.h>
 
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
@@ skipping 294 matching lines @@
 }
 
 void TouchTabStripLayout::AdjustTrailingStackedTabs() {
   int index = tab_count() - 1;
   int max_stacked_x = width_ - size_.width() - max_stacked_width();
   while (index > active_index() &&
          ideal_x(index) - ideal_x(index - 1) <= stacked_padding_ &&
          ideal_x(index - 1) >= max_stacked_x) {
     index--;
   }
-  if (ideal_x(index) - ideal_x(index - 1) <= stacked_padding_ &&
+  if (index > active_index() &&
+      ideal_x(index) - ideal_x(index - 1) <= stacked_padding_ &&
       ideal_x(index - 1) >= max_stacked_x) {
     index--;
   }
   if (index >= tab_count() - max_stacked_count_)
     return;
   int first_stacked = index;
   int x = width_ - size_.width() -
       std::min(tab_count() - first_stacked, max_stacked_count_) *
       stacked_padding_;
   for (; index < first_stacked + max_stacked_count_;
@@ skipping 51 matching lines @@
       result += " ";
     if (i == active_index())
       result += "[";
     result += base::IntToString(view_model_->ideal_bounds(i).x());
     if (i == active_index())
       result += "]";
   }
   return result;
 }
 #endif