Handful of tweaks for tab dragging with touch:

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 50 matching lines @@
   // What should happen as the mouse is dragged within the tabstrip.
   enum MoveBehavior {
     // Only the set of visible tabs should change. This is only applicable when
     // using touch layout.
     MOVE_VISIBILE_TABS,
 
     // Typical behavior where tabs are dragged around.
     REORDER
   };
 
+  // Amount above or below the tabstrip the user has to drag before detaching.
+  static const int kTouchVerticalDetachMagnetism;
+  static const int kVerticalDetachMagnetism;
+
   TabDragController();
   virtual ~TabDragController();
 
   // Initializes TabDragController to drag the tabs in |tabs| originating
   // from |source_tabstrip|. |source_tab| is the tab that initiated the drag and
   // is contained in |tabs|.  |mouse_offset| is the distance of the mouse
   // pointer from the origin of the first tab in |tabs| and |source_tab_offset|
   // the offset from |source_tab|. |source_tab_offset| is the horizontal distant
   // for a horizontal tab strip, and the vertical distance for a vertical tab
   // strip. |initial_selection_model| is the selection model before the drag
@@ skipping 203 matching lines @@
   // If necessary starts the |move_stacked_timer_|. The timer is started if
   // close enough to an edge with stacked tabs.
   void StartMoveStackedTimerIfNecessary(
       const gfx::Point& point_in_screen,
       int delay_ms);
 
   // Returns the TabStrip for the specified window, or NULL if one doesn't exist
   // or isn't compatible.
   TabStrip* GetTabStripForWindow(gfx::NativeWindow window);
 
-  // Returns the compatible TabStrip that is under the specified point (screen
+  // Returns the compatible TabStrip to drag to at the specified point (screen
   // coordinates), or NULL if there is none.
-  TabStrip* GetTabStripForPoint(const gfx::Point& point_in_screen);
+  TabStrip* GetTargetTabStripForPoint(const gfx::Point& point_in_screen);
 
   // Returns true if |tabstrip| contains the specified point in screen
   // coordinates.
   bool DoesTabStripContain(TabStrip* tabstrip,
                            const gfx::Point& point_in_screen) const;
 
   // Returns the DetachPosition given the specified location in screen
   // coordinates.
   DetachPosition GetDetachPosition(const gfx::Point& point_in_screen);
 
@@ skipping 260 matching lines @@
   // Non-null for the duration of RunMoveLoop.
   views::Widget* move_loop_widget_;
 
   // If non-null set to true from destructor.
   bool* destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(TabDragController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_