Support detaching/attaching panels via inter-strip drags.

chrome/browser/ui/panels/overflow_panel_strip.h

Index: chrome/browser/ui/panels/overflow_panel_strip.h
diff --git a/chrome/browser/ui/panels/overflow_panel_strip.h b/chrome/browser/ui/panels/overflow_panel_strip.h
index 3ffcf5acf5c90912a86b36cb488f5baa17981f35..59e2ccf60c81107ae05a23d38a154814ce1eeeae 100644
--- a/chrome/browser/ui/panels/overflow_panel_strip.h
+++ b/chrome/browser/ui/panels/overflow_panel_strip.h
@@ -43,10 +43,17 @@ class OverflowPanelStrip : public PanelStrip,
   virtual void MinimizePanel(Panel* panel) OVERRIDE;
   virtual void RestorePanel(Panel* panel) OVERRIDE;
   virtual bool CanShowPanelAsActive(const Panel* panel) const OVERRIDE;
+  virtual void SavePanelPlacement(Panel* panel) OVERRIDE;
+  virtual void LoadSavedPanelPlacement() OVERRIDE;
+  virtual void DiscardSavedPanelPlacement()  OVERRIDE;
   virtual bool CanDragPanel(const Panel* panel) const OVERRIDE;
-  virtual void StartDraggingPanel(Panel* panel) OVERRIDE;
-  virtual void DragPanel(Panel* panel, int delta_x, int delta_y) OVERRIDE;
-  virtual void EndDraggingPanel(Panel* panel, bool cancelled) OVERRIDE;
+  virtual void StartDraggingPanelLocally(Panel* panel) OVERRIDE;
+  virtual void DragPanelLocally(Panel* panel,
+                                int delta_x,
+                                int delta_y) OVERRIDE;
+  virtual void EndDraggingPanelLocally(Panel* panel, bool cancelled) OVERRIDE;
+  virtual void AddDraggingPanel(Panel* panel,
+                                const gfx::Point& position) OVERRIDE;
 
   void OnFullScreenModeChanged(bool is_full_screen);