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 495f05c6e130741cd0d2fb59fbd5bb9e4e1dc738..ba67467b36726eb43811724004cbd26f0b9e1013 100644
--- a/chrome/browser/ui/panels/panel.h
+++ b/chrome/browser/ui/panels/panel.h
@@ -230,6 +230,8 @@ class Panel : public BrowserWindow,
   const gfx::Size& max_size() const { return max_size_; }
   bool auto_resizable() const { return auto_resizable_; }
 
+  bool in_preview_mode() const { return in_preview_mode_; }
+
   bool draggable() const;
 
   // The restored size is the size of the panel when it is expanded.
@@ -259,6 +261,13 @@ 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);
+
+  // Sets whether the panel is shown in preview mode. When the panel is
+  // being dragged, it is in preview mode.
+  void SetPreviewMode(bool in_preview_mode);
+
   // 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_; }
@@ -312,6 +321,14 @@ class Panel : public BrowserWindow,
   // True if this panel auto resizes based on content.
   bool auto_resizable_;
 
+  // True if this panel should stay always on top of other windows.

[jennb, 2012/03/08 23:41:09]

s/stay always/always stay

[jianli, 2012/03/09 21:48:58]

Done.

+  bool always_on_top_;
+
+  // True if this panel is in preview mode. That is, panel bounds should not be

[jennb, 2012/03/08 23:41:09]

s/That is,/When in preview mode

[jianli, 2012/03/09 21:48:58]

Done.

+  // affected by layout refresh. This is currently used by drag controller to
+  // add a panel to the strip without causing its bounds changed.

[jennb, 2012/03/08 23:41:09]

s/changed/to change

[jianli, 2012/03/09 21:48:58]

Done.

+  bool in_preview_mode_;
+
   // Platform specifc implementation for panels.  It'd be one of
   // PanelBrowserWindowGtk/PanelBrowserView/PanelBrowserWindowCocoa.
   NativePanel* native_panel_;  // Weak, owns us.
@@ -319,9 +336,6 @@ 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);