Support detaching/attaching panels via inter-strip drags.

chrome/browser/ui/panels/panel.h

Index: chrome/browser/ui/panels/panel.h
diff --git a/chrome/browser/ui/panels/panel.h b/chrome/browser/ui/panels/panel.h
index b464b83bf03c9fb38ce91ca1743b140261ebdfb4..83cc27c321c3ca6fcd2efd2101f2d40fa82621ae 100644
--- a/chrome/browser/ui/panels/panel.h
+++ b/chrome/browser/ui/panels/panel.h
@@ -221,6 +221,7 @@ class Panel : public BrowserWindow,
 
   // May be NULL if panel is newly created and has not been positioned yet.
   PanelStrip* panel_strip() const { return panel_strip_; }
+  void set_panel_strip(PanelStrip* panel_strip) { panel_strip_ = panel_strip; }
 
   // Moves the panel to the |new_strip|, removing the panel from its
   // current strip.
@@ -261,6 +262,9 @@ class Panel : public BrowserWindow,
   // Sets whether the panel app icon is visible in the taskbar.
   void SetAppIconVisibility(bool visible);
 
+  // Sets whether the panel window is always on top.
+  void SetAlwaysOnTop(bool on_top);
+
   // Newly created panels may be placed in a temporary layout until their
   // final position is determined.
   bool has_temporary_layout() const { return has_temporary_layout_; }
@@ -321,9 +325,6 @@ class Panel : public BrowserWindow,
   ExpansionState expansion_state_;
   ExpansionState old_expansion_state_;
 
-  // Indicates whether the panel app icon is visible in the taskbar.
-  bool app_icon_visible_;
-
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(Panel);