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 e9af790902a7c23a633e974a15be742092623dc7..3ccdce0a5a1f3c2bddb7b359132fcaebc4b6cc68 100644
--- a/ui/base/x/x11_util.h
+++ b/ui/base/x/x11_util.h
@@ -94,8 +94,14 @@ 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_borders);
+
 // These functions do not cache their results --------------------------
 
+// Returns true if the shape extension is supported.
+UI_BASE_EXPORT bool IsShapeExtensionAvailable();
+
 // Get the X window id for the default root window
 UI_BASE_EXPORT XID GetX11RootWindow();
 
@@ -167,6 +173,10 @@ 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,