Do not show notifications when in fullscreen or screensaver mode....

ui/base/x/x11_util.h

Index: ui/base/x/x11_util.h
===================================================================
--- ui/base/x/x11_util.h	(revision 72012)
+++ ui/base/x/x11_util.h	(working copy)
@@ -17,6 +17,7 @@
 
 #include "base/basictypes.h"
 
+typedef unsigned long Atom;
 typedef struct _GdkDrawable GdkWindow;
 typedef struct _GtkWidget GtkWidget;
 typedef struct _GtkWindow GtkWindow;
@@ -76,11 +77,15 @@
 bool IsWindowVisible(XID window);
 // Returns the bounds of |window|.
 bool GetWindowRect(XID window, gfx::Rect* rect);
-// Get the value of an int, int array, or string property.  On
+// Return true if |window| has any property with |property_name|.
+bool PropertyExists(XID window, const std::string& property_name);
+// Get the value of an int, int array, atom array or string property.  On
 // success, true is returned and the value is stored in |value|.
 bool GetIntProperty(XID window, const std::string& property_name, int* value);
 bool GetIntArrayProperty(XID window, const std::string& property_name,
                          std::vector<int>* value);
+bool GetAtomArrayProperty(XID window, const std::string& property_name,
+                          std::vector<Atom>* value);
 bool GetStringProperty(
     XID window, const std::string& property_name, std::string* value);
 
@@ -178,6 +183,9 @@
 // to set your own error handlers.
 void SetDefaultX11ErrorHandlers();
 
+// Return true if a given window is in full-screen mode.
+bool IsX11WindowFullScreen(XID window);
+
 }  // namespace ui
 
 #endif  // UI_BASE_X_X11_UTIL_H_