Make File-Picker modal on Linux

chrome/browser/ui/libgtk2ui/gtk2_util.h

Index: chrome/browser/ui/libgtk2ui/gtk2_util.h
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_util.h b/chrome/browser/ui/libgtk2ui/gtk2_util.h
index 92d06d16f2bc90d8a9487e5d4b5996fc2c4d9bd7..bb76e44e83712e8a625465cc6c3cec7e72054595 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_util.h
+++ b/chrome/browser/ui/libgtk2ui/gtk2_util.h
@@ -25,6 +25,10 @@ namespace ui {
 class Accelerator;
 }
 
+namespace views{
+class DesktopWindowTreeHostX11;
+}
+
 namespace libgtk2ui {
 
 void GtkInitFromCommandLine(const base::CommandLine& command_line);
@@ -53,6 +57,18 @@ aura::Window* GetAuraTransientParent(GtkWidget* dialog);
 // Clears the transient parent for |dialog|.
 void ClearAuraTransientParent(GtkWidget* dialog);
 
+// Sets the |host| as a property of |dialog|.
+void SetDesktopWindowTreeHost(GtkWidget* dialog,
+    views::DesktopWindowTreeHostX11* host);
+
+// Sets the |host| as a property of |dialog|.
+void SetDesktopWindowTreeHost(GtkWidget* dialog,
+    views::DesktopWindowTreeHostX11* host);
+
+// Gets the DesktopWindowTreeHostX11 for |dialog|.
+views::DesktopWindowTreeHostX11* GetDesktopWindowTreeHost(GtkWidget* dialog);
+
+
 }  // namespace libgtk2ui
 
 #endif  // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UTIL_H_