Support detaching/attaching panels via inter-strip drags.

chrome/browser/ui/panels/detached_panel_strip.h

Index: chrome/browser/ui/panels/detached_panel_strip.h
diff --git a/chrome/browser/ui/panels/detached_panel_strip.h b/chrome/browser/ui/panels/detached_panel_strip.h
index 4ea0c4f64b19c568206802f4502588e7f36aaeeb..d5e883561cc12b4dc25357e16ba40f7708e17ed0 100644
--- a/chrome/browser/ui/panels/detached_panel_strip.h
+++ b/chrome/browser/ui/panels/detached_panel_strip.h
@@ -38,10 +38,17 @@ class DetachedPanelStrip : 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;
 
   bool HasPanel(Panel* panel) const;
 
@@ -49,6 +56,13 @@ class DetachedPanelStrip : public PanelStrip {
   const Panels& panels() const { return panels_; }
 
  private:
+  struct PanelPlacement {
+    Panel* panel;
+    gfx::Point position;
+
+    PanelPlacement() : panel(NULL) { }
+  };
+
   PanelManager* panel_manager_;  // Weak, owns us.
 
   // All panels in the panel strip must fit within this area.
@@ -57,6 +71,9 @@ class DetachedPanelStrip : public PanelStrip {
   // Collection of all panels.
   Panels panels_;
 
+  // Used to save the placement information for a panel.
+  PanelPlacement saved_panel_placement_;
+
   DISALLOW_COPY_AND_ASSIGN(DetachedPanelStrip);
 };