Attempt 3 at a better touch tabstrip. There is still a bunch to do,

chrome/browser/ui/views/tabs/default_tab_drag_controller.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/default_tab_drag_controller.h"
 
 #include <math.h>
 #include <set>
 
 #include "base/callback.h"
@@ skipping 302 matching lines @@
     : source_tabstrip_(NULL),
       attached_tabstrip_(NULL),
       source_tab_offset_(0),
       offset_to_width_ratio_(0),
       old_focused_view_(NULL),
       last_move_screen_loc_(0),
       started_drag_(false),
       active_(true),
       source_tab_index_(std::numeric_limits<size_t>::max()),
       initial_move_(true),
+      // TODO: remove.
       stacking_(false) {
   instance_ = this;
 }
 
 DefaultTabDragController::~DefaultTabDragController() {
   if (instance_ == this)
     instance_ = NULL;
 
   MessageLoopForUI::current()->RemoveObserver(this);
 
@@ skipping 14 matching lines @@
     const std::vector<BaseTab*>& tabs,
     const gfx::Point& mouse_offset,
     int source_tab_offset,
     const TabStripSelectionModel& initial_selection_model) {
   DCHECK(!tabs.empty());
   DCHECK(std::find(tabs.begin(), tabs.end(), source_tab) != tabs.end());
   source_tabstrip_ = source_tabstrip;
   source_tab_offset_ = source_tab_offset;
   start_screen_point_ = GetCursorScreenPoint();
   mouse_offset_ = mouse_offset;
-  stacking_ = source_tabstrip->IsStacking();
 
   drag_data_.resize(tabs.size());
   for (size_t i = 0; i < tabs.size(); ++i)
     InitTabDragData(tabs[i], &(drag_data_[i]));
   source_tab_index_ =
       std::find(tabs.begin(), tabs.end(), source_tab) - tabs.begin();
 
   // Listen for Esc key presses.
   MessageLoopForUI::current()->AddObserver(this);
 
@@ skipping 1107 matching lines @@
 }
 
 // static
 bool TabDragController::IsActive() {
 #if defined(USE_AURA) || defined(OS_WIN)
   return TabDragController2::IsActive() || (instance_ && instance_->active());
 #else
   return instance_ && instance_->active();
 #endif
 }