Make File-Picker modal on Linux

chrome/browser/ui/libgtk2ui/gtk2_util.cc

Index: chrome/browser/ui/libgtk2ui/gtk2_util.cc
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_util.cc b/chrome/browser/ui/libgtk2ui/gtk2_util.cc
index cd72e9841b4c014cc45a1153eb6382e12d684163..5603f7a5a7e5031f092972c8068049f9bcaffbc8 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_util.cc
+++ b/chrome/browser/ui/libgtk2ui/gtk2_util.cc
@@ -23,6 +23,8 @@
 namespace {
 
 const char kAuraTransientParent[] = "aura-transient-parent";
+const char kDesktopWindowTreeHost[] = "desktop-window-tree-Host";
+
 
 void CommonInitFromCommandLine(const base::CommandLine& command_line,
                                void (*init_func)(gint*, gchar***)) {
@@ -140,4 +142,14 @@ void ClearAuraTransientParent(GtkWidget* dialog) {
   g_object_set_data(G_OBJECT(dialog), kAuraTransientParent, NULL);
 }
 
+void SetDesktopWindowTreeHost(GtkWidget* dialog,
+    views::DesktopWindowTreeHostX11* host) {
+  g_object_set_data(G_OBJECT(dialog), kDesktopWindowTreeHost, host);
+}
+
+views::DesktopWindowTreeHostX11* GetDesktopWindowTreeHost(GtkWidget* dialog) {
+  return reinterpret_cast<views::DesktopWindowTreeHostX11*>(
+      g_object_get_data(G_OBJECT(dialog), kDesktopWindowTreeHost));
+}
+
 }  // namespace libgtk2ui