Make panels not show on top when there is an app running in full screen mode.

chrome/browser/ui/panels/panel_manager.h

Index: chrome/browser/ui/panels/panel_manager.h
diff --git a/chrome/browser/ui/panels/panel_manager.h b/chrome/browser/ui/panels/panel_manager.h
index e7319b3c02008affcb1317627345e6305acb8ca3..6c6573bbf677122a5e2fc22d34ba96db9bcf54dd 100644
--- a/chrome/browser/ui/panels/panel_manager.h
+++ b/chrome/browser/ui/panels/panel_manager.h
@@ -10,6 +10,7 @@
 #include "base/basictypes.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/timer.h"
 #include "chrome/browser/ui/panels/auto_hiding_desktop_bar.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "ui/gfx/rect.h"
@@ -100,6 +101,8 @@ class PanelManager : public AutoHidingDesktopBar::Observer {
     return panel_strip_.get();
   }
 
+  bool is_full_screen_mode_on()  const { return is_full_screen_mode_on_; }
+
 #ifdef UNIT_TEST
   static int horizontal_spacing() { return PanelStrip::horizontal_spacing(); }
 
@@ -179,6 +182,11 @@ class PanelManager : public AutoHidingDesktopBar::Observer {
   // will not be affected.
   bool auto_sizing_enabled_;
 
+  // Timer used to track if the current active app is in full screen mode.
+  base::RepeatingTimer<PanelManager> full_screen_mode_timer_;
+  void CheckFullScreenMode();
+  bool is_full_screen_mode_on_;
+
   DISALLOW_COPY_AND_ASSIGN(PanelManager);
 };