Linux UI: Add IsVisibleOnAllWorkspaces()

ui/views/widget/widget.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_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 503 matching lines @@
   // Sets the widget to be on top of all other widgets in the windowing system.
   void SetAlwaysOnTop(bool on_top);
 
   // Returns whether the widget has been set to be on top of most other widgets
   // in the windowing system.
   bool IsAlwaysOnTop() const;
 
   // Sets the widget to be visible on all work spaces.
   void SetVisibleOnAllWorkspaces(bool always_visible);
 
+  // Is this widget currently visible on all workspaces?
+  // A call to SetVisibleOnAllWorkspaces(true) won't necessarily mean
+  // IsVisbleOnAllWorkspaces() == true (for example, when the platform doesn't
+  // support workspaces).
+  bool IsVisibleOnAllWorkspaces() const;
+
   // Maximizes/minimizes/restores the window.
   void Maximize();
   void Minimize();
   void Restore();
 
   // Whether or not the window is maximized or minimized.
   virtual bool IsMaximized() const;
   bool IsMinimized() const;
 
   // Accessors for fullscreen state.
@@ skipping 436 matching lines @@
   bool movement_disabled_;
 
   ScopedObserver<ui::NativeTheme, ui::NativeThemeObserver> observer_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_