Allow panels to be created as detached panels.

chrome/browser/ui/panels/detached_panel_strip.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_PANELS_DETACHED_PANEL_STRIP_H_
 #define CHROME_BROWSER_UI_PANELS_DETACHED_PANEL_STRIP_H_
 
 #include <set>
 #include "base/basictypes.h"
 #include "chrome/browser/ui/panels/panel.h"
@@ skipping 47 matching lines @@
                                            bool aborted) OVERRIDE;
   virtual void ClearDraggingStateWhenPanelClosed() OVERRIDE;
   virtual void UpdatePanelOnStripChange(Panel* panel) OVERRIDE;
   virtual void OnPanelActiveStateChanged(Panel* panel) OVERRIDE;
 
   bool HasPanel(Panel* panel) const;
 
   int num_panels() const { return panels_.size(); }
   const Panels& panels() const { return panels_; }
 
+  // Returns default top-left to use for a detached panel whose position is
+  // not specified during panel creation.
+  gfx::Point GetDefaultPanelOrigin();
+
  private:
+  // Offset the default panel top-left position by kPanelTilePixels. Wrap
+  // around to initial position if position goes beyond display area.
+  void ComputeNextDefaultPanelOrigin();
+
   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.
   gfx::Rect display_area_;
 
   // Collection of all panels.
   Panels panels_;
 
   // Used to save the placement information for a panel.
   PanelPlacement saved_panel_placement_;
 
+  // Default top-left position to use for next detached panel if position is
+  // unspecified by panel creator.
+  gfx::Point default_panel_origin_;
+
   DISALLOW_COPY_AND_ASSIGN(DetachedPanelStrip);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_DETACHED_PANEL_STRIP_H_