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

chrome/browser/ui/views/tabs/tab_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_CONTROLLER_H_
 #pragma once
 
 class BaseTab;
 class TabStripSelectionModel;
 
 namespace gfx {
 class Point;
 }
 namespace views {
 class MouseEvent;
 }
 
 // Controller for tabs.
 class TabController {
  public:
   virtual const TabStripSelectionModel& GetSelectionModel() = 0;
 
+  // Returns true if multiple selection is supported.
+  virtual bool SupportsMultipleSelection() = 0;
+
   // Selects the tab.
   virtual void SelectTab(BaseTab* tab) = 0;
 
   // Extends the selection from the anchor to |tab|.
   virtual void ExtendSelectionTo(BaseTab* tab) = 0;
 
   // Toggles whether |tab| is selected.
   virtual void ToggleSelected(BaseTab* tab) = 0;
 
   // Adds the selection from the anchor to |tab|.
@@ skipping 39 matching lines @@
 
   // Informs that an active tab is selected when already active (ie - clicked
   // when already active/foreground).
   virtual void ClickActiveTab(const BaseTab* tab) const = 0;
 
  protected:
   virtual ~TabController() {}
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_CONTROLLER_H_