Make File-Picker modal on Linux

ui/views/widget/desktop_aura/x11_desktop_handler.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_
 
 #include <X11/Xlib.h>
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
 #include <vector>
 
 #include "ui/aura/env_observer.h"
+#include "ui/aura/scoped_window_targeter.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/gfx/x/x11_atom_cache.h"
 #include "ui/gfx/x/x11_types.h"
 #include "ui/views/views_export.h"
 
 template <typename T> struct DefaultSingletonTraits;
 
 namespace views {
 
 // A singleton that owns global objects related to the desktop and listens for
@@ skipping 32 matching lines @@
   void ProcessXEvent(XEvent* event);
 
   // ui::PlatformEventDispatcher
   bool CanDispatchEvent(const ui::PlatformEvent& event) override;
   uint32_t DispatchEvent(const ui::PlatformEvent& event) override;
 
   // Overridden from aura::EnvObserver:
   void OnWindowInitialized(aura::Window* window) override;
   void OnWillDestroyEnv() override;
 
+  // Make dialog modal.
+  void SetModalDialog(XID dialog);
+
  private:
   enum ActiveState {
     ACTIVE,
     NOT_ACTIVE
   };
 
   X11DesktopHandler();
   ~X11DesktopHandler() override;
 
   // Handles changes in activation.
@@ skipping 17 matching lines @@
   ::Window current_window_;
 
   // Whether we should treat |current_window_| as active. In particular, we
   // pretend that a window is deactivated after a call to DeactivateWindow().
   ActiveState current_window_active_state_;
 
   ui::X11AtomCache atom_cache_;
 
   bool wm_supports_active_window_;
 
+  XID modal_dialog_xid_;
+
+  scoped_ptr<aura::ScopedWindowTargeter> scoped_targeter_;
+
   DISALLOW_COPY_AND_ASSIGN(X11DesktopHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_