Panels not getting focus on Linux when expanded from API on Linux.

chrome/browser/ui/panels/panel_browser_window_gtk.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_PANEL_BROWSER_WINDOW_GTK_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_GTK_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/ui/gtk/browser_window_gtk.h"
@@ skipping 23 matching lines @@
 
   // BrowserWindow overrides
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual void ShowSettingsMenu(GtkWidget* widget,
                                 GdkEventButton* event) OVERRIDE;
   virtual TitleDecoration GetWindowTitle(std::string* title) const OVERRIDE;
 
   // ui::WorkAreaWatcherXObserver override
   virtual void WorkAreaChanged() OVERRIDE;
 
+  // Overrides BrowserWindowGtk::NotificationObserver::Observe
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
  protected:
   // BrowserWindowGtk overrides
   virtual bool GetWindowEdge(int x, int y, GdkWindowEdge* edge) OVERRIDE;
   virtual bool HandleTitleBarLeftMousePress(
       GdkEventButton* event,
       guint32 last_click_time,
       gfx::Point last_click_position) OVERRIDE;
   virtual void SaveWindowPosition() OVERRIDE;
   virtual void SetGeometryHints() OVERRIDE;
   virtual bool UseCustomFrame() OVERRIDE;
@@ skipping 135 matching lines @@
   // Used to animate the bounds change.
   scoped_ptr<PanelBoundsAnimation> bounds_animator_;
   gfx::Rect animation_start_bounds_;
 
   // This records the bounds set on the last animation progress notification.
   // We need this for the case where a new bounds animation starts before the
   // current one completes. In this case, we want to start the new animation
   // from where the last one left.
   gfx::Rect last_animation_progressed_bounds_;
 
+  content::NotificationRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(PanelBrowserWindowGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_GTK_H_