Add unittests for X11TopmostWindowFinder

ui/base/x/x11_util.h

Index: ui/base/x/x11_util.h
diff --git a/ui/base/x/x11_util.h b/ui/base/x/x11_util.h
index e80d6cb8c875871f3e6a7c79ad6e0a9f3c567f41..479de1ceaca9697d63d35e9f17f67d4c32d26ae3 100644
--- a/ui/base/x/x11_util.h
+++ b/ui/base/x/x11_util.h
@@ -93,6 +93,9 @@ UI_BASE_EXPORT void HideHostCursor();
 // Returns an invisible cursor.
 UI_BASE_EXPORT ::Cursor CreateInvisibleCursor();
 
+// Sets whether |window| should use the OS window frame.
+UI_BASE_EXPORT void SetUseOSWindowFrame(XID window, bool use_os_window_frame);
+
 // These functions do not cache their results --------------------------
 
 // Returns true if the shape extension is supported.
@@ -169,6 +172,10 @@ UI_BASE_EXPORT bool SetIntArrayProperty(XID window,
                                         const std::string& name,
                                         const std::string& type,
                                         const std::vector<int>& value);
+UI_BASE_EXPORT bool SetAtomProperty(XID window,
+                                    const std::string& name,
+                                    const std::string& type,
+                                    Atom value);
 UI_BASE_EXPORT bool SetAtomArrayProperty(XID window,
                                          const std::string& name,
                                          const std::string& type,